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Strain hardening behavior of a TRIP/TWIP steel with 18.8% Mn

机译：Mn为18.8％的TRIP / TWIP钢的应变硬化行为

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摘要

Tensile tests were carried out to study the strain hardening behavior of a TRIP/TWIP steel with 18.8% manganese. The results indicated that the true stress-strain curve can be divided into 4 stages in tension testing. Material is in an elastic region when the true strain is below 0.06. In the initial stage of the plastic deformation (ε = 0.06-0.14), ε-martensite was preliminarily formed, and that austenite transformed to a-martensite through the e-martensite formation. When the true strain was between 0.14 and 0.35, the stacking fault energies were elevated by the increase of strain energy, deformation twinning occurred instead of the e-martensite formation. The second derivative of the stress-strain curve satisfied the condition d~2/dε~2 > 0. Twinning induced plasticity dominated this stage. In the last plastic deformation stage (ε = 0.35-0.45), γ→ a transformation occurred at the crossing of twins, and a-martensite grew along the thickness of the twinned regions.
机译：进行拉伸测试以研究含18.8％锰的TRIP / TWIP钢的应变硬化行为。结果表明，在拉伸试验中，真实的应力-应变曲线可以分为四个阶段。当真实应变低于0.06时，材料处于弹性区域。在塑性变形的初始阶段（ε= 0.06-0.14），初步形成了ε-马氏体，该奥氏体通过e-马氏体的形成转变为α-马氏体。当真实应变在0.14和0.35之间时，堆垛层错能通过应变能的增加而升高，发生变形孪晶而不是电子马氏体形成。应力-应变曲线的二阶导数满足条件d〜2 /dε〜2>0。孪生诱导的可塑性主导了这一阶段。在最后的塑性变形阶段（ε= 0.35-0.45），在孪晶的相交处发生了γ→转变，并且α-马氏体沿着孪晶区域的厚度生长。

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