| 消除TRIP钢屈服平台的预拉伸实验及微观机理 |
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| 引用本文： | 熊自柳,江海涛,蔡庆伍,唐荻,刘仁东.消除TRIP钢屈服平台的预拉伸实验及微观机理[J].北京科技大学学报,2008,30(4):379-382. |
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| 作者姓名： | 熊自柳 江海涛 蔡庆伍 唐荻 刘仁东 |
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| 作者单位： | 1. 北京科技大学材料科学与工程学院,北京,100083
2. 鞍山钢铁公司技术中心,鞍山,114021 |
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| 摘 要： | 含铬高硅TRIP钢室温变形时通常具有较长的屈服平台,在成型过程中零件表面容易出现褶皱等缺陷.为了解决这个问题,采用预拉伸实验研究了不同预拉伸变形量对TRIP钢屈服平台的影响,并且对拉伸前后的TRIP钢试样做了TEM透射分析以期找出形成屈服平台的机制.实验表明:随着预拉伸量增加,屈服平台长度减少,当预变形量达到1.0%时屈服平台消失;在相同预拉伸条件下,奥氏体越稳定,屈服平台越短;柯氏气团和奥氏体的应力松弛机制共同对TRIP钢屈服平台的形成起作用.
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| 关 键 词： | TRIP钢 屈服平台 微观机理 预拉伸 应力诱导相变 亚稳奥氏体 应力松弛 |
| 修稿时间： | 2007年3月7日 |
Tension test and microstructural mechanism for eliminating the yield platform of TRIP steel |
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| XIONG Ziliu,JIANG Haitao,CAI Qingwu,TANG Di,LIU Rendong.Tension test and microstructural mechanism for eliminating the yield platform of TRIP steel[J].Journal of University of Science and Technology Beijing,2008,30(4):379-382. |
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| Authors: | XIONG Ziliu JIANG Haitao CAI Qingwu TANG Di LIU Rendong |
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| Abstract: | In order to solve the problem of drape defaults which usually appear on the surface of parts,pre-stretching experiments were done to investigate the effect of prestretching deformation on the yield platform of high-Si,low-Cr TRIP steel,and the microstructures were characterized by TEM before and after the tensile process to find out the forming mechanism of the yield platform.The result shows that the length of the yield platform always decreases with increasing prestretching deformation and disappears at the point of 1.0% prestretching.The specimens with more stable austenite possess shorter yield platforms under the same deformation condition.Yield platform formation of TRIP steel results from Cottrel atmosphere and stress relaxation-induced austenite transformation. |
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| Keywords: | TRIP steel yield platform microstructural mechanism prestretching strain-induced transformation metastable austenite stress relaxation |
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