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国家自然科学基金(50671033)

作品数:2 被引量:6H指数:1
相关作者:宋申华陈贤淼更多>>
相关机构:哈尔滨工业大学更多>>
发文基金:国家自然科学基金更多>>
相关领域:金属学及工艺一般工业技术更多>>

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Modelling of grain boundary impurity segregation during high temperature plastic deformation
2011年
A modified theoretical model is proposed to predict the grain boundary segregation of impurity atoms during high temperature plastic deformation. The model is based on the supersaturated vacancy-impurity complex created by plastic deformation and involves quasi-thermodynamics and kinetics. Model predictions are made for phosphorus grain boundary segregation during plastic deformation in ferrite steel. The results reveal that phosphorus segregates at grain boundaries during plastic deformation. At a given temperature, under a certain strain rate the segregation increases with increasing deformation amount until reaching a steady value, and at the same deformation amount it increases with increasing strain rate. The predicted results are compared with the available experimental values, indicating that there is a reasonable agreement between the theoretical predictions and the experimental observations.
CHEN XianMiaoSONG ShenHua
高温塑性变形引起的P非平衡晶界偏聚被引量:6
2009年
阐述了高温塑性变形引起的非平衡晶界偏聚的准热力学和动力学,并使用该模型预测了低合金结构钢中高温塑性变形导致的P在奥氏体晶界的非平衡偏聚.研究发现:当变形为20%,应变速率为1×10-3s-1时,在800℃左右会出现一个P的晶界偏聚浓度峰值;在1000℃变形为20%时,晶界偏聚浓度随着应变速率的增加而增加.预测结果与现有的实验结果基本一致.
陈贤淼宋申华
关键词:非平衡偏聚晶界塑性变形
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