On the effect of chemical composition on yield strength of TWIP steels

Kusakin, Pavel; Belyakov, Andrey; Molodov, Dmitri A.; Kaibyshev, Rustam

doi:10.1016/j.msea.2017.01.080

Cited by 51 publications

(18 citation statements)

References 21 publications

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“…Hot deformation of high-Mn austenitic TWIP steels with low SFE is accompanied by the development of discontinuous dynamic recrystallization (DRX), which may lead to the microstructures with desired grain size and dislocation density, providing required level of mechanical properties. [10][11][12][13] Discontinuous DRX develops through nucleation and growth of new grains consuming work-hardened neighbors with high DOI: 10.1002/adem.202000098…”

Section: Introductionmentioning

confidence: 99%

“…Commonly, the semiproducts of high‐Mn TWIP steels are processed by thermomechanical treatment involving hot working. Hot deformation of high‐Mn austenitic TWIP steels with low SFE is accompanied by the development of discontinuous dynamic recrystallization (DRX), which may lead to the microstructures with desired grain size and dislocation density, providing required level of mechanical properties . Discontinuous DRX develops through nucleation and growth of new grains consuming work‐hardened neighbors with high dislocation density, which is a driving force for the DRX development .…”

Section: Introductionmentioning

confidence: 99%

“…The aim of this study is to clarify the hot deformation behavior of promising 18%Mn TWIP steels, which may exhibit a tensile elongation above 60% with a strength of more than 1000 MPa . The study is particularly focused on the relationship between the DRX mechanisms and dislocation substructures upon hot working of steels with different contents of carbon, which is one of the main alloying elements of high‐Mn TWIP steels, that strongly affects the mechanical properties . The deep understanding the mechanisms of microstructure evolution during hot working of structural steels and alloys is very important for the development of intelligent processing technologies providing semiproducts with controlled mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

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Hot Deformation and Dynamic Recrystallization of 18%Mn Twinning‐Induced Plasticity Steels

et al. 2020

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The deformation behavior of 18%Mn twinning‐induced plasticity (TWIP) steels with 0.4%C or 0.6%C is studied by means of isothermal compression tests in the temperature range of 973–1373 K at the strain rates of 10−3–10−1 s−1. The hot working is accompanied by the development of discontinuous dynamic recrystallization (DRX), which is commonly advanced by an increase in deformation temperature and/or a decrease in strain rate. A decrease in the carbon content promotes the DRX development, though the flow stresses scarcely depend on the carbon content. The change in the DRX kinetics results in the specific distributions of the grain orientation spread (GOS) among the DRX grains, depending on deformation conditions. The maximal fraction of grains with small GOS below 1° corresponding to rapid DRX development is observed at certain temperature/strain rate, although the DRX fraction increases with a decrease in temperature‐compensated strain rate and can be related to the fraction of grains with GOS below 4°. The texture of DRX grains is also determined by the orientations of grains with GOS below 4°. The grain boundary mobility for the DRX grain growth is characterized by an activation energy close to that for grain boundary diffusion.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hot Deformation and Dynamic Recrystallization of 18%Mn Twinning‐Induced Plasticity Steels

et al. 2020

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“…The Fe-18%Mn-0.6%C steel exhibits higher strength and elongation than the Fe-18%Mn-0.4%C steel after rolling warm to hot rolling in the studied temperature range. This additional strengthening of the Fe-18%Mn-0.6%C steel can be attributed to the difference in carbon content, which has been considered as the contributor to the yield strength of high-Mn TWIP steels [15]. The difference in 0.2 wt % carbon should result in about 85 MPa difference in the yield strength [15].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…This additional strengthening of the Fe-18%Mn-0.6%C steel can be attributed to the difference in carbon content, which has been considered as the contributor to the yield strength of high-Mn TWIP steels [15]. The difference in 0.2 wt % carbon should result in about 85 MPa difference in the yield strength [15]. An apparent saturation for the total elongation of the Fe-18%Mn-0.4%C steel with an increase in the rolling temperature above 1073 K can be associated with a variation in the deformation mechanisms operating during tensile tests.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Deformation Behavior of High-Mn TWIP Steels Processed by Warm-to-Hot Working

Torganchuk

Глезер

Belyakov

et al. 2018

Metals

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The deformation behavior of 18%Mn TWIP steels (upon tensile tests) subjected to warm-to-hot rolling was analyzed in terms of Ludwigson-type relationship, i.e., σ = K 1 •ε n1 + exp(K 2 − n 2 •ε). Parameters of K i and n i depend on material and processing conditions and can be expressed by unique functions of inverse temperature. A decrease in the rolling temperature from 1373 K to 773 K results in a decrease in K 1 concurrently with n 1. Correspondingly, true stress approached a level of about 1750 MPa during tensile tests, irrespective of the previous warm-to-hot rolling conditions. On the other hand, an increase in both K 2 and n 2 with a decrease in the rolling temperature corresponds to an almost threefold increase in the yield strength and threefold shortening of the stage of transient plastic flow, which governs the duration of strain hardening and, therefore, manages plasticity. The change in deformation behavior with variation in the rolling temperature is associated with the effect of the processing conditions on the dislocation substructure, which, in turn, depends on the development of dynamic recovery and recrystallization during warm-to-hot rolling.

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