Tensile deformation behavior of high manganese austenitic steel: The role of grain size
Tensile deformation behavior of high manganese austenitic steel: The role of grain size
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DOI：
10.1016/j.matdes.2010.01.049
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发表时间：
2010-08-01
影响因子：
8.4
通讯作者：
Monir-Vaghefi, S. M.
中科院分区：
文献类型：
--
作者：
Dini, G.;Najafizadeh, A.;Monir-Vaghefi, S. M.
分析了化学成分为Fe-31Mn-3Al-3Si、平均晶粒度为2.1~72.6µm的孪生诱发塑性(TWIP)钢的拉伸变形行为和组织演变。对于每一种晶粒度，研究了描述加工硬化行为的另一种方法--霍洛蒙分析和Crussard-Jaul(C-J)分析。结果表明，通过改变晶粒度可以获得最佳的力学性能与加工硬化能力的函数关系。显微组织观察表明，TWIP钢中平面位错的堆积是触发机械孪生的必要条件，细化的晶粒抑制了机械孪晶的形成。此外，随着外加应变的增加，机械孪晶增加。结果是，由于机械孪晶界而产生的高瞬时加工硬化提高了均匀延伸率。孪生区硬度增加引起的孪生应变和硬化的贡献(即巴辛斯基机制)也可能有助于实现TWIP钢的高强度-塑性。(C)2010爱思唯尔有限公司。保留所有权利。
The tensile deformation behavior and microstructural evolutions of twinning induced plasticity (TWIP) steel with the chemical composition of Fe-31Mn-3Al-3Si and average grain sizes in the range of 2.1-72.6 mu m have been analyzed. For each grain size, the Hollomon analysis and also the Crussard-Jaoul (C-J) analysis as an alternative method to describe the work hardening behavior were investigated. The results indicated that the optimum mechanical properties as a function of work hardening capacity can be obtained by changing the grain size. The microstructural observations showed that the pile-ups of planar dislocations are necessary for triggering the mechanical twinning and grain refinement suppresses the mechanical twinning in TWIP steel. Furthermore, the mechanical twinning increases with increasing applied strain. As a result, a high instantaneous work hardening due to the mechanical twin boundaries enhances the uniform elongation. The contribution from the strain of twinning and hardening due to an increase in the hardness of the twinned regions (i.e., the Basinski mechanism) may be also useful in achieving the high strength-ductility in TWIP steels. (c) 2010 Elsevier Ltd. All rights reserved.