Effects of strain states on stability of retained austenite in medium Mn steels

IF 3.1 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Iron and Steel Research(International) Pub Date : 2017-11-01 DOI:10.1016/S1006-706X(17)30163-2
Mei Xu , Yong-gang Yang , Jia-yong Chen , Di Tang , Hai-tao Jiang , Zhen-li Mi
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引用次数: 7

Abstract

Based on uniaxial tensile and plane strain deformation tests, the effects of strain states on the stability of RA (retained austenite) in medium Mn steels, which were subjected to IA (intercritical annealing) and Q&P (quenching and partitioning) processing, were investigated. The volume fractions of RA before and after deformation were measured at different equivalent strains. The transformation behaviors of RA were also investigated. The stability of RA differed across two different transformation stages at the plane strain state: the stability was much lower in the first stage than in the second stage. For the uniaxial tension strain state, the stability of RA corresponded only to a single transformation stage. The main reason was that there were two types of transformations from RA in the medium Mn steel for the plane strain state. One type was that the martensite originated in the strain-induced stacking faults (SISF). The other type was the strain-induced directly twin martensite at a certain equivalent strain. However, for the uniaxial tension state, only the strain-induced twin martensite was observed. Dislocation lines and dislocation tangles were also observed in specimens deformed at different strain states. In addition, complex microstructures of stacking faults and lath-like phases were observed within a grain at the plane strain state.

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应变状态对中锰钢残余奥氏体稳定性的影响
基于单轴拉伸和平面应变变形试验,研究了应变状态对IA(临界间退火)和Q&P(淬火和分配)处理中Mn钢中残余奥氏体(RA)稳定性的影响。在不同等效应变下,测量变形前后RA的体积分数。研究了RA的转化行为。在平面应变状态下,RA在两个不同转变阶段的稳定性存在差异,第一阶段的稳定性明显低于第二阶段。在单轴拉伸应变状态下,RA的稳定性只对应于一个转变阶段。主要原因是在平面应变状态下,中锰钢存在两种由RA转变而来的相变。一种是马氏体起源于应变诱导的层错(SISF)。另一种是在一定等效应变下应变诱发的直接孪晶马氏体。然而,在单轴拉伸状态下,只观察到应变诱导的双马氏体。在不同应变状态下变形的试样中还观察到位错线和位错缠结。此外,在平面应变状态下,晶粒内部还观察到复杂的层错和板条相组织。
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来源期刊
CiteScore
4.30
自引率
0.00%
发文量
2879
审稿时长
3.0 months
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