高温塑性变形引起的P非平衡晶界偏聚

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^-3 s^-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.关键词：非平衡偏聚晶界塑性变形磷

Non-equilibrium grain boundary segregation of phosphorous during high temperature plastic deformation

The quasi-thermodynamics and the kinetics of deformation-induced non-equilibrium grain boundary segregation are described. This model is used to predict non-equilibrium segregation of P during high temperature plastic deformation in an austenite microstructure. There is a segregation concentration peak of P near 800 ℃ for a strain rate of 1×10^-3 s^-1 and the deformation magnitude is 20%. When the deformation reaches 20% in magnitude at 1000 ℃ the segregation of P at grain boundaries increases with increasing strain rate. The predictions are generally consistent with some available experimental observations.