Strain rate sensitivity of steel. The high m value of 0.

Strain rate sensitivity of steel The impacts of the hot stamping parts were simulated at strain rates range of 10-3-103 s-1. 035 for SLM H13 at laser scan speeds of 100, 200, 400, 800, and 1600 mm/s, respectively. In these papers the three relationships are proofed which allow to calculate the stress, the strain and We elucidate here the temperature and strain rate sensitivity of a duplex stainless steel through the development of deformation maps and by studying the flow behaviour during hot compression tests in the temperature range of 1223–1473 K and at strain rates between 0. 5Mg before and after room temperature ECAP [82]. 0 sec ⁻¹ ). Strain rate sensitivity is usually determined by performing strain rate change tests during either uniaxial tension or compression tests. Post-deformation microstructure evaluation on UNS S31603 specimens showed slip, twinning and martensitic transformation, while the duplex alloys exhibited slip, twinning Jun 1, 2020 · We evaluate the strain rate sensitivity (SRS), an indicator of the rate controlling mechanism in the plastic deformation of metals and alloys, for the ultrastrong gradient NC 316L stainless steel by strain rate jump nanoindentation and micropillar compression test. 15 the n-value will increase to maintain the Jan 1, 2006 · The present study examines the strain-rate sensitivity of four high strength, high-toughness alloys at strain rates ranging from 0. Therefore, the strain rate dependency of HE still holds, irrespective of the presence of microcracks. Oct 1, 2012 · A well known viscoplastic strain hardening, strain rate hardening model describing the strain-rate sensitivity of metallic alloys was suggested by Cowper and Symonds [20]. [10] found that the SIMT is suppressed at a high strain rate due to the temperature effect, which implies that fracture toughness may be affected by changing strain rates. Jul 8, 2024 · Strain rate jump testing during a tensile test has obviously the general advantage that the strain rate sensitivity is obtained as a function of the strain at which the strain rate jumps occur [42]. In nanoindentation, the average indentation strain is constant for a specific pyramidal indenter, for example ≈ 8% for a Berkovich indenter [48] . Additionally, hydrogen increases the strain rate sensitivity in 310S steel, and enhances pile-up around indentation with decreasing the strain rate. The results showed that 9Cr18Mo stainless steel presents strain-rate sensitivity and significant thermal softening, that is, the flow stress on 9Cr18Mo stainless steel increases with strain rate Jul 1, 2019 · Micro-damage quantification and associated microstructure characterization in a ferrite/martensite dual-phase (DP) steel were performed after tensile tests with different strain rates of 10 −2 and 10 −4 s −1 in order to understand the strain rate sensitivity of damage initiation resistance and damage arrestability. This corresponds to a ~10% increase in the yield strength over the 7-orders of magnitude change in strain-rate. 2 provides a lower-bound prediction for strain rate sensitivity. The influence of the strain-rate on the armor steel response is quite evident, as shown in Fig. For reference, 10 1 /sec approximates the strain rate observed in a typical stamping. 0590, and 0. The Hart’s instability criterion is [16] (2) 1 σ ∂ σ ∂ ϵ ϵ ˙ − 1 + m ≤ 0. However, the plastic flow of some materials is sensitive to strain rate, which is known as material strain rate sensitivity, or viscoplasticity [3. As expected, the flow stress increases more rapidly in the dynamic regime than in the quasi-static regime. The specimens for the mechanical characterisation were obtained in the longitudinal direction from an hot-rolled wide-flange section HE A [29 Jun 12, 2023 · In this study, a review of previous research that investigates the influence of strain rate on the dynamic and quasi-static behaviour of concrete and steel material behaviour is presented. 209%C martensitic steel and (b) relationship between fracture strain and strain rate. 1, and 1 s−1. Apr 1, 2021 · In this work, the behaviour of A2-70 stainless steel at different strain rates and temperature is analyzed, with particular attention to how strain rate and temperature sensitivities affect necking onset and hardening. In particular, a decrease in the strain rate enables hydrogen diffusion to specific microstructures [28, 29] and crack tips [[30], [31], [32]]. Sep 15, 2023 · The susceptibility to hydrogen embrittlement of ferritic steels is known to increase with decreasing strain rates down to strain rates of 10 − 5 − 10 − 7 s − 1. The strain rate sensitivity is dependent on the strain rate, which is dependent on the plastic strain (eq. Mar 27, 2020 · (a) Determined stress-strain curves at different strain rates of 0. 058±0. 001–750 s −1. 20. 056 ± 0. 8. = 1 + ε ˙ D 1 q where f dyn. 5 were up to this strain rate values only. The deformation characteristics of T91 steel at different temperatures and strain rates are modelled by introducing the power-law and hyperbolic sine equation. 14 (A and C)). Aug 3, 2021 · Strain rate sensitivity generally manifests in terms of hydrogen embrittlement [[25], [26], [27]]. Measured properties were consistent with literature reports on other structural steels. May 22, 2019 · Nevertheless, the strain-rate sensitivity of martensitic stainless steel is significantly higher than the austenitic, (up to more than ten times higher in the commercial manufacturing method). Nov 19, 2019 · In contrast, a pronounced strain rate sensitivity of ductility is observed for (only) the Q&P-processed material at 473 K: Starting at an average uniform elongation of 12. In this work, the combined effects of strain rate and internal hydrogen (from gaseous precharging) on the tensile properties of 304L austenitic stainless steel in both annealed and forged conditions are characterized. 027, 0. (b) True stress-strain curves of Fe-9. 01. Dec 15, 2006 · The true stress is seen to increase with increasing strain rate in both the quasi-static tests and the dynamic impact tests. 1 for mild steel specimens which were tested at various uniaxial compressive strain rates [3. [1] observed increased yielding instability for mild steel in the strain rate range 0. Aug 15, 2007 · A proper method to determine strain-rate sensitivity of a material is to make very small, but measurable changes in strain rate at constant structure and constant temperature, to measure the corresponding changes in flow stress, avoiding changes in deformation history from one sample to another and eliminate strain hardening and temperature changes experienced by different samples of the alloy. 010 at low strain rates (5. Jul 1, 2021 · Compression tests at strain-rates between 10 2 /s and 10 4 /s were conducted with SHPB. At high strain rates an instability, such as upper and lower yield strengths, is present. The current findings indicate that both the rapid work hardening and negative strain rate sensitivity of Hadfield steel polycrystals are influenced by dynamic strain aging. Since no rupture of the steel plate occurred in the explosion Dec 1, 2015 · The strain-rate sensitive constitutive behavior of A36 and A1011 steel was investigated in this study by means of uniaxial tension testing at eight strain rates, covering seven orders of magnitude. The variation of the curve with the increasing strain rates indicates the strain rate sensitivity of the steel. For the UFG steel, the variation in hardness as a function of strain rate is summarized in Fig. Jan 1, 2022 · In the present work, a set of SPT is carried out to understand the strain rate sensitivity of T91 Ferritic-martensitic steel at two different temperatures. Therefore, engineers use the stable value of lower yield stress to design structural components. These results show that positive strain rate sensitivity was observed with the May 1, 2011 · To quantitatively analyze the stress experienced by the material during SMAT, the empirical rate-sensitivity Johnson–Cook model [39] was adopted: (5) σ T = [A + B ε n] 1 + C ln ε ˙ ε ˙ 0, where σ T is equivalent stress, ε is equivalent plastic strain, ε ˙ is plastic strain rate, ε ˙ 0 is the reference strain rate for a quasi Nov 1, 2008 · The present work investigated the effect of strain rates (10 −3 to 10 3 s −1) on the deformation behaviour of a twinning-induced plasticity (TWIP) steel. A two-stage strain rate sensitivity of strength is found with a gradually increasing slope at low strain rates and a much steeper rise at high strain rates, which is further amplified at higher triaxiality stress states. 2]. 028, and 0. Oct 31, 2023 · The strain rate sensitivity parameter m for DP 600, and DP 800 shown in Table 3 indicate a positive strain-rate sensitivity. 005 and 500 s−1. Mar 8, 2024 · By conducting tensile tests on specimens of TRIP steel at various strain rates, Talonen et al. Apr 1, 2015 · In this study we demonstrate for an austenitic TWIP steel with 18% Mn a strong dependence of the twinning rate on the strain rate, which results in negative strain hardening rate sensitivity (SHRS). Mechanical response of HS was obtained from monotonic and strain rate jump experiments under uniaxial tensile loading within the 10−4 to 10−1 s−1 strain rate Oct 18, 2021 · The true stress-strain curves of the steel at different strain rates are illustrated in Fig. It is expected that the predictions from Eq. shown in [5,6]. 0573 for impact tests performed at temperatures of 20, 150, 300, and 450 range. In this study, strain rate sensitivity is evaluated for several different grades of steel. 004 – 0. 5×10 3 s −1). Apr 24, 2020 · Hot compression tests were performed on AISI 321 austenitic stainless steel in the deformation temperature range of 800–1200°C and constant strain rates of 0. Sep 1, 2019 · Strain hardening, strain rate sensitivity, and strain rate-dependent tensile behavior suggest that the tensile plasticity of L-PBF 316L SS is controlled by very fine microstructural length scales, consistent with the deformation mechanisms and fracture behavior of these materials revealed by transmission and scanning electron microscopy. The strain rate sensitivity shows a positive–negative-positive changing tendency with increasing strain rate. Aug 15, 2023 · (a) True stress-strain curves of IF steel at various strain rates ranging from 10 − 5 s − 1 to 10 s − 1. Aug 1, 2023 · Singh et al. Variations of the strain hardening exponent with strain Oct 1, 2019 · On the other hand, the strain rate sensitivity values were obtained from three different series of indentations. The tensile test of an ultra-high strength hot stamping steel was tested using the CMT5105 electronic universal testing machine and HTM 16020 electro-hydraulic servo high-speed material testing machine. 7, and the strain-rate dependent material model constant C was fitted by the least square method. stress [MPa] Strain-rate [1/s] Time [s] AA 5059-H131 Fig. Dec 1, 2001 · Unfortunately the resolution of the testing parameters was insufficient to show if this effect also held in the micro-strain region. Severe plastic deformation is known to increase the strain rate sensitivity of fcc materials, an example of which is shown in Fig. Jan 10, 2018 · As seen in Fig. 02 to 0. Jan 1, 2017 · Mechanical behaviour of quenched and self-tempered reinforcing steel in tension under high strain rate 2009, Strain-Rate Sensitivity of a Pultruded E-Glass Feb 15, 2019 · The strain rate sensitivity of the CoCrFeNi HEA transitions from 0. A finite-difference numerical technique which incorporates material inertia, elastic-strain hardening and strain-rate sensitivity is used to establish the strain-rate sensitivity constants p and D in the equation, σ4 = σ1 (1+(∊/D)1/ p). 01 to 0. May 10, 2016 · A new multiscale modeling approach is proposed to predict the contributions of dynamic strain aging (DSA) and the resulting negative strain rate sensitivity (NSRS) on the unusual strain-hardening response of Hadfield steel (HS). 19 for Al-1. A higher strain rate sensitivity with ultra high purity was indicated in the 1/10 rate change plot of Stein and Low [7], and this trend is consistent with the current finding shown in Fig. Feb 17, 2022 · According to the viewpoint that the governing mechanism for the strain hardening rate sensitivity is the strain rate-dependent twinning rate in TWIP steel [12, 27], the slower twin growth rate at a large strain, which may be caused by the temperature rise effect as analyzed in the previous section, indicates the weakening of the twinning Dec 10, 2020 · The dynamic tensile behavior of the twinning-induced plasticity (TWIP) steel with the vanadium carbide is investigated at different strain rates of 10−4, 10−3, 10−2 and 0. The strain rate sensitivity was studied in terms of instantaneous strain rate sensitivity (ISRS) and strain rate sensitivity of work-hardening (SRSW). 0660, 0. eq. The relationship between determined equivalent plastic strains at fracture and applied strain rates of martensitic steel is depicted in Fig. Mar 15, 2016 · Finally, in a previous study by the current authors [32], where the strain rate behaviour in tension has been studied, the strain rate sensitivity and the strain hardening capacity were demonstrated. By varying temperature and strain rate, a new bidirectional reciprocating strain rate jump experiment was conducted to evaluate the effect of strain rate on the SRS index m. 619 - 626 Aug 1, 2018 · Watanabe and Ishikawa (2009) have reported a low strain rate sensitivity of ∼10 −6 for basal slip and extension twin, and a strain rate sensitivity of ∼0. strain rate is increased further, the ultimate tensile strength and uniform elongation of Type 304L increase similar to Type 309, because adiabatic heating occurs at intermediate and high strain rates. Mechanical twins and epsilon martensite laths develop before ε eng. 5% at a strain rate of 10 May 17, 2023 · This study reports the evolution of strain rate sensitivity (SRS) a novel 3. To characterize the strain rate sensitivity, medium strain rate tests were conducted at strain rates ranging from 10 -3 /sec (commonly found in tensile tests) to 10 3 /sec. Jun 1, 2020 · Advanced strain rate-jump nanoindentation is used to measure the SRS of the gradient NC stainless steel at different locations. 007 depending on the alloy. 1. Jan 7, 2025 · The strain-rate sensitivity exponents (m) were determined to be 0. 24. f stat . 2. 02 for prismatic slip. The results indicated that indentation hardness depended on not only the indentation size but also the strain rate of the indentation level. This phenomenon is illustrated in Figure 3. 1, and 1. Jan 7, 2025 · In experimental findings, AM Ti6Al4V showcases a noticeably higher strain-rate sensitivity, with values reaching up to 0. is the dynamic yield true stress, f stat. 0775 in the commercial S410-L steel is an Apr 15, 2015 · The present work investigated the effect of strain rates (10 −3 to 10 3 s −1) on the deformation behaviour of a twinning-induced plasticity (TWIP) steel. 1 s −1 to investigate the rate-dependent behavior of indentation hardness and continuous strain rate sensitivity. Magnetic measurements and mechanical behavior Metall. is the static Feb 22, 2024 · The ability of a material to stretch in tension is strongly influenced by the strain rate sensitivity and this parameter plays an even bigger role during deformation of ultrafine and nanocrystalline materials. Feb 21, 2017 · The dependence of the strain rate sensitivity of advanced ~1 GPa tensile strength steels on the phases present in their microstructures was studied by testing different steels at 0. Moreover, experimental data on the heterostructured materials’ strain-rate-sensitive mechanical properties is scarce. 1 s −1. Variations of the strain hardening exponent Experimental results on a mild steel are reported from ballistics tests which gave rise to strain rates of up to 105 s−1. Dec 1, 2024 · The strain rate sensitivity (SRS) is an essential parameter for comprehending the deformation behaviour of nanocrystalline materials [32], [33], [34]. Feb 1, 1992 · Strain rate sensitivity is an important material property in the formability of sheet metal. Upper yield point is more sensitive to the strain rate compared to the lower yield point. Impact properties were evaluated with Charpy testing. 8 and strain rate of 0. Jan 1, 2025 · Effects of strain state and strain rate on deformation-induced transformation in 304 stainless steel Part I. 001, 0. 01 and 30 s −1. It was recently shown that a deformation mechanism based on grain boundary sliding can predict the strain rate sensitivity of these materials and the conditions for superplastic Up to a strain rate of about 1s -1 only a small to moderate increase in yield strength of about 70MPa for this steel type is obtained. 10 tests are conducted on the NC 316L stainless steel at the depth of 2 μm, 300 μm, and 1500 μm from the topmost peened surface with the strain rate set in the range from 0. The results show that the stainless steel is moderately strain rate sensitive in the region of yield. Engineering stress and strain-rate versus time @ 300s−1 and 1000s−1 for AA 5059-H131. In addition to investigating the dynamic impact response of the steel, the following questions are intended to be answered in this manuscript: (a) How does grain size influence the SRS of AISI 321 steel? Feb 1, 2023 · The strain rate dependent mechanical properties of lath martensite are important for developing ultrahigh strength steels for automobile applications. 2% plastic strain), strain rate plays a negligible role in large plastic deformation of L907A steel for the volume and number of dimples gradually increase but the depth of dimples decreases as strain rate is gradually increased. Jul 1, 2004 · For rate-sensitive materials, the presence of the strain rate sensitivity of the flow stress, m, helps to sustain the homogeneous deformation. 11. Jul 15, 2016 · It is possible to observe the strain rate sensitivity of the structural steel S355 on both the strength and the fracture strain. 01–0. In general, pure metals exhibit positive SRS, which means the flow stress increases with increasing strain rate Feb 1, 2021 · The compression behavior of a Ti-8Al-1Mo-1 V alloy with bimodal microstructure has been studied in the strain rate range of 2 × 10-3 s −1-2 × 10-1 s −1. So according to eq. May 15, 2020 · The CSM nanoindentation experiments were carried out in the strain rate range of 0. Jan 19, 2021 · Due to their high strength, formability and affordable cost, quenched and partitioned (Q&P) steels have shown the potential to reduce the mass of vehicles, thereby decreasing fuel consumption during service. (Data in Fig. The m-values are quite low compared to most metals which typically fall in the range of 0. 6. Jan 28, 2019 · The results showed that the strain rate sensitivity exhibited decrease almost linearly when the strain amplitude increased from 0. 333 at high strain rates (2. May 7, 2019 · The strain rate sensitivity m was determined by assuming that indentation hardness and strain rate are equivalent to stress and strain rate under tensile test [28]. The literature attributes this strain rate sensitivity to the diffusion of hydrogen. (2)) in Type310S steel becomes higher after the introduction of H [4, 20, 30], substantiating our statement on the role of solute H Jul 28, 2018 · This paper demonstrates the successful printing of H13 tool steel by a selective laser melting (SLM) method at a scan laser speed of 200 mm/s for the best microstructure and mechanical behavior. Specifically, the nanoindentation strain-rate sensitivity values were 0. The results of the present study were used to assess and understand the strain rate sensitivity behavior of SS400 structural steel during low-cycle fatigue. 5×10 3 –6. In fact, only pre-strain rate dependence in TWIP steel before hydrogen charging has been reported previously [17]. 5×10 3 s −1) to 0. Coarse Apr 1, 1991 · The tensile data show that the lower yield stress is approximately twice as strain rate sensitive as stresses in the hardening region and that the ultimate tensile strain is approximately unaffected by strain rate effects up to a strain rate of 20 s-1. Large-scale molecular dynamics simulations further revealed that this transition is related to the plastic deformation mechanism transition from dislocation May 10, 2019 · In this study, a series of optical microscope examinations, constant loading rate indentation (CLR), and creep indentation (CI) tests were performed on room temperature to investigate the strain rate sensitivity behavior of the SM490 structural steel weld zone. Feb 14, 2022 · The derivative of the strain rate sensitivity in Eq. 8, and it should be pointed out that the true stress-strain relations after necking are not considered in this work. The results show that in the low strain rate (10-3-10<sup . 3 × 10–4 to 3800 s−1. The typical definition of Apr 1, 2023 · While there exists strong positive rate sensitivity of yield stress during the initial straining stage (about 0. As a result, the average SRS values of SS400 structural steel of 0. Furthermore, because a lower mass of steel is used in each vehicle, energy consumption associated with the steelmaking process is also reduced. 0594, 0. 04, while forging shows 0. The microstructures and properties of deformed samples under different strain rates were investigated comparatively. 0002 s-1 to 200 s-1: Aermet 100, a modified 4340, modified HP9-4-20, and a recently developed Eglin AFB steel alloy, ES-1c. CORE – Aggregating the world’s open access research papers May 19, 2022 · The Fe–29Mn–3Al–3Si twin-induced plasticity (TWIP) steel is used to conduct quasi-static compression and dynamic impact deformation with strain rates ranging from 8. Exhaustive investigations based on experimental and Aug 5, 2024 · Embrittlement was observed in electrodeposited copper containing 26. The strain and strain rate dependence of the deformation behavior of Type 304 stainless steel sheet was evaluated by constant temperature tensile testing in the temperature range of −80 °C to 160 °C. 5. 002 was reported. In comparison, conventionally processed Ti6Al4V through hot rolling demonstrates a strain-rate sensitivity of 0. 5 s −1 and strain ≤0. The strain rate is an important material property especially in blast analysis, as it has a significant effect as the material enters the plastic zone. 02 was reported for SS400 steel and was highly consistent with the general trend reported for several types of structural steel in the literature. Specifically, the strain-rate sensitivity exponent m, is found to be in the range of 0. 05 s−1. 2 is an approximation since it considered the threshold stress as a constant. Strain rate sensitivity varies from 0. The yield strength increases from 1410 to 1776 MPa when the strain rate increases from 10 –3 to 1400 s −1. Jan 1, 2024 · The distribution maps of strain rate sensitivity coefficient are constructed when the strain are 0. Therefore, it is reasonable to assume that Eq. 01 to 10 −0. 001 s −1 to 0. For a given strain level, the flow stress of Type 309 increases with strain rate and the increase is more rapid at the high strain rates. Hot flow curves were used to determine the strain hardening exponent and the strain rate sensitivity exponent, and to construct the processing maps. Oct 18, 2021 · The true stress-strain curves of the steel at different strain rates are illustrated in Fig. 2–0. 4% to 1. range. Strain-rate (300 1/s) Strain-rate (1000 1/s) eng. Here, taken 2 GPa grade press hardening steel as a model material, we explored the strain rate sensitivity of lath martensite and the underlying physics. As a result, the m-value decreases with increasing plastic strain level during tensile testing. A novel high-rate testing apparatus (HRTA) was designed which employs an impact pendulum as the source of energy. 4. A. The high m value of 0. 0%. The relation between dynamic stress and strain rate is given by: (6) f dyn . The results demonstrate the existence of a reliable correlation between the strain rate sensitivity values and evolved microstructures. = 0. , 13A ( 1982 ) , pp. The strain rate sensitivity (SRS) value of 0. Apr 2, 2021 · The strain rate sensitivity of each steel decreased with increasing strain. Two distinct regimes of strain rate sensitivity on yield strength are found in a high-strength nantwinned steel. Jun 9, 2021 · Hot compression tests were performed on AISI 321 austenitic stainless steel in the deformation temperature range of 800–1200°C and constant strain rates of 0. In the research findings, it is indicated that an increase in strain rate (SR) leads to a hardening of the alloy. ) Beyond 10 3 s -1 the sensitivity to strain rate becomes extreme. Jan 1, 1992 · Strain rate and temperature effects on the flow stress of 304N stainless steel were investigated using data obtained from torsion tests on thin-walled tubular specimens, at given strain rates of between 10 −3 and 10 −1 with temperatures ranging from 83 to 296 K. 019, 0. Jan 1, 2021 · Strain-rate sensitivity, work hardening, and fracture behavior are assessed by conducting uniaxial tensile testing at different strain rates (0. Mar 1, 2022 · Tests and fractography allowed to draw systematic conclusions on the response of the DP1000 steel. 4 ± 1. This indicates that sintered 316L stainless steel is strongly strain rate sensitive at high strain rates. The results indicated ening and strain rate hardening. This average value was used to generate the strain rate sensitivity behavior used for the FE analysis as shown in Fig. 1]. 6 . May 21, 2019 · Hydrogen increases the hardness at all strain rates, and the effect of hydrogen-induced hardening becomes stronger with increasing the strain rate in 310S steel. Due to its high corrosion resistance, strength, and formability, 304L has a wide variety of applications, including pressure vessels, valves, and other manifold The strain rate sensitivity variations at an applied strain of 0. 22 (b), which could be used to calculate the JC rate A slower strain rate always led to a considerably higher hydrogen concentration along the prone PAGB (Fig. 5, the YS and UTS strain rate sensitivities are very similar between ε ̇ = 2 × 10 −2 and ε ̇ = 2 × 10 2 /s, whereas the UTS strain rate sensitivity is lower than the YS strain rate sensitivity from ε ̇ = 2 × 10 −4 to ε ̇ = 2 × 10 −2 /s. 6Al Medium Mn steel (MMS) with an ultrafine equiaxed dual-phase structure. Trans. We have analyzed these results in terms of existing strain-rate sensitivity, work hardening, and yield locus models. (c) Evolution of strain-rate sensitivity with strain for the present RT-Q&P steel (red full circles), IF steel (black Nov 1, 2008 · The room temperature strain rate sensitivity of Hadfield steel polycrystals was investigated with the aid of in situ digital image correlation. This Aug 1, 2019 · In this study, the strain rate sensitivity of AISI 321 austenitic stainless steel impacted only in the high strain rate regime is investigated. Also, the strain hardening rate and exponent of the alloys increased with decreasing strain rate. Aug 15, 2023 · The strain rate dependent deformation behavior of material is typically described by the strain-rate sensitivity (SRS) parameter m, defined as m = ∂ σ / ∂ ln ε ˙ where σ is the flow stress and ε ˙ is the strain rate. 057. Ulacia et al. The strain rate sensitivity, strain hardening rate, and ductility reflected the compctition of two strengthening mechanisms: strain-induced transformation of austenite to martensite and Jun 1, 2017 · The ISRS, the steady-state strain rate sensitivity (SSSRS) and the SRSW for strain rate jump tests can be calculated using the following equations [12], [45]: (4) m i = ln (σ i / σ 1) ln (ε ̇ 2 / ε ̇ 1), m s s = ln (σ 2 / σ 1) ln (ε ̇ 2 / ε ̇ 1), m w = m s s − m i where σ i is the instantaneous true stress, σ 1 and σ 2 are the strain-rate properties for selected perimeter and core column steels include yield and tensile strength, total elongation and strain rate sensitivity for rates up to 400 s-1. The strain rate sensitivity increases beyond 1s -1, up to a value of about 10 3 s -1. It can be noted that the material keeps its strain hardening capacity with increasing strain-rate. Apr 15, 2015 · The present work investigated the effect of strain rates (10 −3 to 10 3 s −1) on the deformation behaviour of a twinning-induced plasticity (TWIP) steel. 5Mn steel at various strain rates ranging from 10 − 5 s − 1 to 600 s − 1. 5). (2010) have reported that the pyramidal slip has a strain rate sensitivity of ∼0. 1 s−1 were compared with the microstructural evolutions. 01, 0. The strain rate sensitivity was studied in terms of instantaneous strain rate sensitivity (ISRS) and strain rate sensitivity of work-hardening (SRSW). The high strain rate tests were performed using a Nov 5, 2024 · Moreover, through innovative bidirectional jump experiments, variations in the strain rate sensitivity index m under various conditions are obtained. Microstructure characterization, carried out using back scatter electron diffraction (EBSD) and transmission electron microscopy (TEM), shows a homogeneous face center cubic structured matrix with uniformly Oct 1, 2019 · The strain rate-dependent behaviors of material properties were validated through the experimental and the numerical verifications. Nov 29, 2023 · Abstract. 14 (B and D)) than the high-strain-rate counterparts (Fig. Apr 1, 2018 · Specifically, the strain rate sensitivity exponent is the logarithmic derivative of the material flow stress to strain rate, where m is the strain rate sensitivity [55]. The instantaneous component of SHRS is large and negative, while its transient is close to zero. Q&P steels utilize the deformation-induced Sep 14, 2016 · In addition, the effect of strain rate on the HE susceptibility has been reported earlier in conventional high strength steels [34], [35], but it has not been confirmed in Fe-Mn-C TWIP steels. Each of these alloys exhibit only modest strain-rate sensitivity. The flow curves exhibited softening after attaining a peak Sep 1, 2024 · Indeed, strain rate sensitivity (or the amount of stress relaxation, which has the same physical sense with an increasing S, cf. Based on high strain rate sensitivity coefficient, low deformation resistance and high GB stability, workability parameters are optimized as: temperature 1000–1150 °C, strain rate 0. 0 ppm hydrogen, with a strain rate sensitivity such that the embrittlement was exacerbated at lower strain rate (5 × 10 It details the test conditions and discusses the results, particularly focusing on strain rate sensitivity and methods of employing the tensile properties in the finite element package, ABAQUS. 1, and 1 s−1. DP600 steel shows higher m-values than DP800 steel. Strain-rate sensitivity was found to follow a thermal activation law over the entire range of strain rates used in this investigation. 022, 0. 022 for the steels tested. 0×10 −5 –2. vitcjd jrr tyi fuofjl skgx tvlpvc zwnvj zrsdwp fbvz tqpbzzk xgmthj dgrfvag ckmodr yrozk cqbrfbkl