Phase transition and defect relaxation behavior in a medium manganese steel
Phase transition and defect relaxation behavior in a medium manganese steel
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DOI：
10.1016/j.jallcom.2022.164003
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发表时间：
2022-02
影响因子：
6.2
通讯作者：
Xueqing Liu;M. Sun;Ju-hua Liang;T. Hao;Weibin Jiang;Yunlong Wang;Xianping Wang;Qianfeng Fang-Qianfeng
中科院分区：
文献类型：
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作者：
Xueqing Liu;M. Sun;Ju-hua Liang;T. Hao;Weibin Jiang;Yunlong Wang;Xianping Wang;Qianfeng Fang-Qianfeng
本文主要用内耗技术系统地研究了Fe-7 Mn-0.1C中锰钢的相变和缺陷弛豫行为。从升温和降温过程的IF曲线可以观察到两个弛豫IF峰（升温时P1位于~ 200° C，降温时P2位于~ 550° C）和两个相变IF峰（升温时Ptr 1位于~ 670° C，降温时Ptr 2位于~ 300° C）。当显微组织中存在θ相和/或残余奥氏体（γ R）时，P1峰消失，并与Snoek-Kê-Köster弛豫（SKK弛豫）有关。P2峰是由奥氏体晶界弛豫（γ）引起的。Ptr 1和Ptr 2的形成机制分别来自逆奥氏体相变（RAT）和马氏体相变（MT）。此外，在本工作中，Ptr 1的明显不对称性，峰高的变化，Ptr 1和Ptr 2峰之间的差异，以及IF研究对力学性能的影响进行了详细讨论。这些结果为高性能中锰钢的设计提供了有价值的参考。
Phase transition and defect relaxation behavior of a Fe-7Mn-0.1 C medium manganese steel have been systematically studied mainly by using internal friction (IF) technique. From temperature-dependent IF curves in both heating and cooling processes, two relaxation IF peaks (the P 1 located at~ 200° C on heating and the P 2 at~ 550° C on cooling) and two phase transition IF peaks (the P tr1 located at~ 670° C on heating and the P tr2 at~ 300° C on cooling) were observed. The P 1 peak disappears when the cementite (θ) particles and/or retained austenite (γ R) exist in the microstructure, and is associated with the Snoek-Kê-Köster relaxation (SKK relaxation). The P 2 peak is suggested to be originated from grain boundary relaxation in austenite (γ). The formation mechanisms of the P tr1 and the P tr2 come from reverse austenitic transformation (RAT) and martensitic transformation (MT), respectively. In addition, the apparent asymmetry of the P tr1, the variation of peak height, the difference between the P tr1 and P tr2 peaks, and the effect of IF studies on the mechanical properties are discussed in detail in the present work. These results provide a valuable reference for the design of high-performance medium Mn steels.