| 形变温度对高锰T RI P／T WI P钢拉伸性能和组织的影响 |
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| 引用本文： | 鲁法云,刘彤妍,杨平,张朋.形变温度对高锰T RI P／T WI P钢拉伸性能和组织的影响[J].武汉冶金科技大学学报,2012(4):281-288,316. |
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| 作者姓名： | 鲁法云 刘彤妍 杨平 张朋 |
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| 作者单位： | 北京科技大学材料科学与工程学院,北京100083 |
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| 摘 要： | 研究合金成分为18 M n-0 .15C-3Si-3 Al的高锰T RIP/T W IP钢（18 M n钢）在 40 ～200oС 范围内的拉伸变形行为,分析形变温度对其拉伸性能、相组成和显微组织的影响. 采用EBSD取向成像分析方法着重研究了〈111〉取向的奥氏体晶粒在拉伸过程中的相组成变化. 结果表明,随着形变温度的升高,18 M n钢的抗拉强度和延伸率大体上呈降低趋势,T RIP效应很快消失,形变孪晶和位错滑移取代马氏体相变成为主要的形变机制,即奥氏体晶粒内形变机制的变化为：α’- M相变→ε- M相变→形变孪晶→位错滑移.18 M n钢中较硬的铁素体在形变过程中能提高材料的加工硬化率,但同时也会引起低温脆性
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| 关 键 词： | 高锰钢 形变温度 T RIP效应 马氏体相变 力学性能 |
Influence of deformation temperature on the microstructure and properties of a high manganese TRIP/TWIP steel |
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| Authors: | Lu Fayun Liu Tongyan Yang Ping Zhang Peng |
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| Affiliation: | (School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China) |
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| Abstract: | The tensile deformation behavior of 18Mn-0.15C-3Si-3Al steel was investigated at temperatures ranging from --40℃to 200 ℃. The influence of deformation temperature on tensile properties, phase constitutes and microstructure of the steel was analyzed. EBSD measurement was used to reveal the change of phase constitutes in （111）-oriented austenitic grains. The results show that, as the temperature rises, both tensile strength and elongation decrease and TRIP effect disappears fast, and me- chanical twinning and dislocation slip dominate. The deformation mechanism evolution is that a＇-martensitic transformation →ε-martensitic transformation →mechanical twinning →dislocation slip. Besides, the harder ferrite in 18Mn steel can enhance work hardening rate, yet causing low temperature brittleness. |
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| Keywords: | high manganese steel deformation temperature TRIP effect martensitic transformation mechanical property |
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