Quasi-static and dynamic deformation mechanisms interpreted by microstructural evolution in TWinning Induced Plasticity (TWIP) steel

Park, Jaeyeong; Kang, Minju; Sohn, Seok Su; Kim, Sang‐Heon; Kim, Hyoung Seop; Kim, Nack J.; Lee, Sunghak

doi:10.1016/j.msea.2016.12.037

Cited by 70 publications

(30 citation statements)

References 45 publications

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“…Figures 4 – 6 shows FCC and BCC inverse pole figure (IPF) maps of the quasi-statically or dynamically tensioned A850, A900, and A950 specimens, respectively, at different true strains. Since the dynamically tensioned specimen is rapidly fractured, the interrupted dynamic tensile test was performed after a newly designed dynamic tensile specimen was placed in an external interruption device 26 . In this interrupted test, basic assumptions of the split Hopkinson tensile bar test, i.e ., uniform strain in the specimen and one-dimensional wave, have been violated 27 , and dynamic stress-strain curves could be problematic because this problem might be unsolvable owing to the nature of dynamic tests.…”

Section: Resultsmentioning

confidence: 99%

“…Plate-shaped tensile specimens (gage length; 30 mm, width; 5 mm, thickness; 1 mm, longitudinal orientation) were tested at strain rate of 10 −3 s −1 at room temperature by a universal testing machine (capacity; 100 kN, model; Instron 8801, Instron Corp., Canton, MA, USA). A split Hopkinson tensile bar was used for dynamic tensile tests 26 , 48 – 50 , whose schematic diagram is presented in Supplementary Fig. S3 .…”

Section: Methodsmentioning

confidence: 99%

“…The strain rate was about 3000 s -1 . Detailed descriptions of the dynamic test are provided in references 26 , 48 – 50 . In order to reduce noises in the data, raw stress-strain curves were smoothened by an adjacent-averaging method 51 , 52 .…”

Section: Methodsmentioning

confidence: 99%

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Interpretation of dynamic tensile behavior by austenite stability in ferrite-austenite duplex lightweight steels

Park

Jeong

et al. 2017

Sci Rep

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Phenomena occurring in duplex lightweight steels under dynamic loading are hardly investigated, although its understanding is essentially needed in applications of automotive steels. In this study, quasi-static and dynamic tensile properties of duplex lightweight steels were investigated by focusing on how TRIP and TWIP mechanisms were varied under the quasi-static and dynamic loading conditions. As the annealing temperature increased, the grain size and volume fraction of austenite increased, thereby gradually decreasing austenite stability. The strain-hardening rate curves displayed a multiple-stage strain-hardening behavior, which was closely related with deformation mechanisms. Under the dynamic loading, the temperature rise due to adiabatic heating raised the austenite stability, which resulted in the reduction in the TRIP amount. Though the 950 °C-annealed specimen having the lowest austenite stability showed the very low ductility and strength under the quasi-static loading, it exhibited the tensile elongation up to 54% as well as high strain-hardening rate and tensile strength (1038 MPa) due to appropriate austenite stability under dynamic loading. Since dynamic properties of the present duplex lightweight steels show the excellent strength-ductility combination as well as continuously high strain hardening, they can be sufficiently applied to automotive steel sheets demanded for stronger vehicle bodies and safety enhancement.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Interpretation of dynamic tensile behavior by austenite stability in ferrite-austenite duplex lightweight steels

Park

Jeong

et al. 2017

Sci Rep

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“…In general, the studies on dynamic deformation of Fe-C-Mn-Al system steels were mainly focused on TRIP and TWIP steels [12][13][14][15]. Tang et al [12] studied the dynamic behavior of Fe-15Mn-3Al-0.23C TRIP/TWIP steel.…”

Section: Introductionmentioning

confidence: 99%

“…They indicated that the strain rate had no significant effect on the TRIP effect, and deformation twinning was the primary deformation mechanism with the increase of strain rate from 7 to 700 s −1 . Park et al [13] investigated the quasi-static and dynamic deformation mechanism of Fe-15Mn-1.2Al-0.6C TWIP steel. They demonstrated that the TWIP steel showed higher strength and similar ductility under dynamic loading because of the favorable effect of the increased planar slip and twinning on tensile properties.…”

Section: Introductionmentioning

confidence: 99%

Strain rate effects on mechanical properties of Fe-10Mn-5Al-0.5C steel

He¹,

Yang²,

Zhu³

et al. 2020

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The tensile deformation behavior of Fe-10Mn-5Al-0.5C steel was studied in an extensive range of strain rate (0.001-1200 s −1). The results show that the steel has high strength (886 MPa) and plasticity (41 %) and exhibits excellent combinations of specific strength and ductility (> 36,000 MPa %) at the strain rate of 0.001 s −1. With the increase of strain rate from 0.001 to 1200 s −1 , the tensile strength of the steel was increased from 886 to 1015 MPa, while its elongation first decreased from 41 to 16 %, and then increased from 16 to 25 %. At the strain rate of 450 s −1 , the elongation is minimal, and the energy absorption capacity is the lowest. With the deformation progresses, the value of n increases from small to large, the strain hardening effect becomes high.

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Strain rate effects on tensile deformation behavior of Fe‐3.5Mn‐0.3C‐5Al ferritic based lightweight steel

Yang

et al. 2020

Materialwissenschaft Werkst

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Tensile deformation behavior of Fe‐3.5Mn‐0.3C‐5Al ferritic based lightweight steel was studied in a large range of strain rate (0.001 s−1–1200 s−1). Microstructures of the steel before and after tension were observed. The results show that Fe‐3.5Mn‐0.3C‐5Al lightweight steel has a good strength (820 MPa) and plasticity (40 %) and exhibits excellent combinations of specific strength and ductility (>32000 MPa %) at the strain‐rate of 0.001 s−1 after annealing at 850 °C for 5 minutes then directly quenching into water. The austenite in the steel tested was transformed into α′‐martensite during the tensile deformation process. With an increase in strain rate from 0.001 s−1 to 1200 s−1, tensile strength of the steel investigated increased from 820 MPa to 932 MPa, while its elongation first decreased from 40 % to 15 %, and then increased from 15 % to 29 %. At the strain rate of 1200 s−1, adiabatic heating resulted in temperature rising in matrix, suppressed the transformation of austenite to α′‐martensite. Comparing with transformation induced plasticity steel, the austenite in 3.5Mn lightweight steel is obviously unstable and cannot provide progressive phase transition.

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Quasi-static and dynamic deformation mechanisms interpreted by microstructural evolution in TWinning Induced Plasticity (TWIP) steel

Cited by 70 publications

References 45 publications

Interpretation of dynamic tensile behavior by austenite stability in ferrite-austenite duplex lightweight steels

Interpretation of dynamic tensile behavior by austenite stability in ferrite-austenite duplex lightweight steels

Strain rate effects on mechanical properties of Fe-10Mn-5Al-0.5C steel

Strain rate effects on tensile deformation behavior of Fe‐3.5Mn‐0.3C‐5Al ferritic based lightweight steel

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