On the relationship between work hardening and twinning rate in TWIP steels
On the relationship between work hardening and twinning rate in TWIP steels
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DOI：
10.1016/j.msea.2012.01.123
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发表时间：
2012-04-30
期刊：
影响因子：
6.4
通讯作者：
Jacques, P. J.
中科院分区：
文献类型：
--
作者：
Renard, K.;Jacques, P. J.
高锰奥氏体 TWIP 钢在颈缩前表现出非常高的强度和伸长率。这些钢的特点是，由于堆垛层错能 (SFE) 较低，因此在应变过程中会形成机械孪晶。通常认为，这些孪生体通过带来动态霍尔和佩奇效应和/或复合效应，对材料的出色性能产生巨大影响。在这项研究中，研究了 Fe-20%Mn-1.2%C TWIP 钢在拉伸应变过程中机械孪晶的出现。通过对不同应变水平的 EBSD 显微照片进行点计数分析来估计孪生率。首先彻底讨论该方法的可靠性。结果表明，孪晶率与加工硬化率之间存在一阶关系。 (C) 2012 Elsevier B.V. 保留所有权利。
High-manganese austenitic TWIP steels exhibit very high strength and elongation before necking. The peculiarity of these steels is that mechanical twins form during straining due to their low stacking fault energy (SFE). These twins are usually thought to have a huge impact on the outstanding properties of the materials, either by bringing about a dynamic Hall & Petch effect and/or a composite effect. In this study, the appearance of mechanical twins during tensile straining is investigated for a Fe-20%Mn-1.2%C TWIP steel. The twinning rate was estimated by means of point counting analysis on EBSD micrographs at different strain levels. The reliability of this method is first thoroughly discussed. It is then shown that there exists a first order relationship between this twinning rate and the work hardening rate. (C) 2012 Elsevier B.V. All rights reserved.