基于层错能的中锰Q&P钢变形机制研究  

Investigation into Deformation Mechanism of Medium Manganese Q&P Steel Based on Stacking Fault Energy

作　　者：吝章国[1] 陈家泳 唐荻[1] 江海涛[1] 段晓鸽[1] 

机构地区：[1]北京科技大学冶金工程研究院,北京100083

出　　处：《华南理工大学学报（自然科学版）》2016年第2期140-146,共7页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51271035);北京科技大学中央高校基本科研业务费专项资金资助项目(FRF-TP-11-005B)~~

摘　　要：首先利用层错能的热力学模型计算了Mn含量分别为5%、7%的中锰Q&P钢中残余奥氏体的层错能,并分析了热处理过程中碳配分对层错能的影响;然后通过XRD、SEM及TEM分析等研究了中锰Q&P钢拉伸变形过程中的变形机制;最后将层错能与实测变形机制相结合分析了两者的关系.结果表明:中锰Q&P钢残余奥氏体的层错能计算必须考虑碳的配分;7Mn-1.5Si-0.2C试样的层错能为4.55 m J/m^2,5Mn-1.5Si-0.2C试样的层错能为17.8 m J/m^2;钢中残余奥氏体含量的对数与变形量成线性关系;中锰Q&P钢的残余奥氏体在变形过程中主要发生的是TRIP效应,这与通过层错能判别的结果相吻合.In this paper,first,the stacking fault energy of the retained austenite in medium manganese Q&P steels respectively with a Mn content of 5% and 7% were calculated by using the thermodynamic model of stacking fault energy,and the effect of carbon partition during the heat treatment on the stacking fault energy was analyzed.Then,the deformation mechanism of the steel under tensile strain was investigated by means of XRD,SEM and TEM,and the relationship between the stacking fault energy and the deformation mechanism was explored.The results show that( 1) carbon partition should be considered during the calculation of the stacking fault energy of medium manganese Q&P steels;( 2) the stacking fault energy of 7Mn-1.5Si-0.2C sample is 4.55 m J / m^2,and that of5Mn-1.5Si-0.2C sample is 17.8 m J / m^2;( 3) there is a linear relationship between the natural logarithm of retained austenite content and the deformation;and( 4) TRIP effect is the main deformation mechanism of medium manganese Q&P steels,which is also verified by the calculated results of the stacking fault energy.

关 键 词：Q&P钢 层错能 变形机制 残余奥氏体 热处理 碳配分 

分 类 号：TG151[金属学及工艺—热处理]