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TWIP Effect and Plastic Instability Condition in an Fe–Mn–C Austenitic Steel

机译：Fe-Mn-C奥氏体钢的TWIP效应和塑性不稳定性条件

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We investigated the correlation among deformation twin density, work hardening, and tensile ductility in an Fe–18Mn–1.2C twinning-induced-plasticity (TWIP) steel, and discussed the correlation with the plastic instability condition. The deformation twin density was varied by changing the deformation temperature from 123 to 523 K. An important factor for the uniform elongation is the work hardening rate in a later deformation stage. The increase in the deformation twin density enhanced the work hardening rate significantly but not monotonically just before the fracture, since the deformation twin density is saturated against plastic strain. In addition, dynamic strain aging in a later deformation stage and ε -martensitic transformation were found to accelerate the fracture due to the localized deformation and the premature fracture, respectively. Accordingly, the relationship between uniform elongation and deformation twin density was not simple. The optimum conditions for the TWIP effect were concluded to be (1) considerable amount of deformation twinning in a later deformation stage, (2) suppression of dynamic strain aging in a later deformation stage, and (3) inhibition of ε -martensitic transformation.
机译：我们研究了Fe–18Mn–1.2C孪生诱导塑性（TWIP）钢的变形孪生密度，加工硬化和拉伸延展性之间的相关性，并讨论了与塑性不稳定性条件的相关性。通过将变形温度从123 K更改为523 K来改变变形孪晶密度。均匀伸长率的重要因素是变形后期的加工硬化率。变形双胞胎密度的增加显着提高了加工硬化速率，但不是在断裂之前就单调提高了，因为变形双胞胎密度对塑性应变而言是饱和的。另外，由于局部变形和过早断裂，发现在变形后期的动态应变时效和ε-马氏体转变分别加速了断裂。因此，均匀伸长率与变形孪晶密度之间的关系并不简单。得出TWIP效应的最佳条件是：（1）在变形后期进行大量变形孪生，（2）在变形后期抑制动态应变时效，以及（3）抑制ε-马氏体转变。

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