| 非热弹性马氏体相变的细观本构模型 |
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| 引用本文： | 孙朝阳,方刚,雷丽萍,曾攀.非热弹性马氏体相变的细观本构模型[J].材料科学与工艺,2009(4):445-449. |
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| 作者姓名： | 孙朝阳 方刚 雷丽萍 曾攀 |
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| 作者单位： | 清华大学机械工程系先进成形制造教育部重点实验室;北京科技大学机械工程学院; |
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| 基金项目： | 国家自然科学基金资助项目(50575124) |
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| 摘 要： | 为了更清楚地认识铁基合金经受非热弹性马氏体相变的本征特性,在细观尺度对非热弹性马氏体相变进行了研究.基于马氏体相变晶体学和内变量本构理论建立了非热弹性马氏体相变的细观本构模型.该模型采用微区相变应变、奥氏体及马氏体的塑性应变表征宏观的非弹性响应,把奥氏体和马氏体变体的等效塑性应变率和体积分数变化率作为内变量描述微观结构变化.模型采用J2流动理论描述微区塑性流动,与采用晶体塑性的描述方法相比模型更简单,且更适用于工程计算.单晶奥氏体单变体简单剪切的模拟结果表明:随着应变的增加,先发生奥氏体塑性变形,进而发生相变,马氏体体积分数与应变呈线性关系;温度较低时易发生马氏体相变并使得材料的强度提高.
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| 关 键 词： | 非热弹性马氏体相变 细观本构模型 J2流动理论 |
A micro-mechanical model of non-thermo-elastic martensitic transformation |
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| SUN Chao-yang,FANG Gang,LEI Li-ping,ZENG Pan.A micro-mechanical model of non-thermo-elastic martensitic transformation[J].Materials Science and Technology,2009(4):445-449. |
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| Authors: | SUN Chao-yang FANG Gang LEI Li-ping ZENG Pan |
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| Affiliation: | SUN Chao-yang1,2,FANG Gang2,LEI Li-ping2,ZENG Pan2(1.Key Laboratory for Advanced Materials Processing Technology of Ministry of Education,Dept.of Mechanical Engineering,Tsinghua University,Beijing 100084,China,2.School of Mechanical Engineering,University of Science , Technology Beijing,Beijing 100083,China) |
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| Abstract: | In order to describe the intrinsic characteristic of ferrous alloy during martensitic transformation,micro-mechanical behavior of non-thermo-elastic martensitic transformation was investigated.Based on the crystallographic theory of martensitic transformation and internal variable constitutive theory,a micro-mechanical constitutive model of non-thermo-elastic martensitic transformation was developed.Plastic strains of product and parent phases as well as the volume fraction of each martensitic variant were ... |
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| Keywords: | non-thermo-elastic martensitic transformation micro-mechanical model J2 flow theory |
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