文献类型：期刊文献

中文题名：形变量对形变热处理中国低活化马氏体钢显微组织的影响

英文题名：Influence of deformation on microstructure of thermomechanical treated China low activation martensitic steel

作者：孙正 赵飞 黄芳

第一作者：孙正

机构：[1]贵州大学材料与冶金学院,贵州贵阳550025;[2]贵州理工学院,贵州贵阳550025

第一机构：贵州大学材料与冶金学院,贵州贵阳550025

年份：2018

卷号：39

期号：7

起止页码：80-85

中文期刊名：材料热处理学报

外文期刊名：Transactions of Materials and Heat Treatment

收录：CSTPCD;;Scopus;北大核心:【北大核心2017】；CSCD:【CSCD2017_2018】；

基金：国家自然科学基金(51461008,51571066)

语种：中文

中文关键词：中国低活化马氏体钢;形变热处理;形变量

外文关键词：China low activation martensitic steel;thermomechanical treatment;deformation

摘要：在Gleeble3500热模拟试验机上对中国低活化马氏体钢进行形变热处理,变形温度为850℃,形变量范围为15%~60%,应变速率为10 s^-1,研究形变量对实验钢显微组织的影响。结果表明：形变热处理后,晶粒出现明显的细化,形变量为60%时晶粒细化最为显著,平均尺寸约为5μm;随着形变量的增加马氏体板条有细化的趋势,同时马氏体板条内部产生高密度位错,为纳米级颗粒碳氮化物MX相的形核提供有利位置,促进MX纳米级颗粒大量析出。当形变量为60%时MX纳米级颗粒数量最多,析出的MX纳米级颗粒进一步阻碍位错的滑移,钉扎位错,起到析出强化的作用,同时具有良好的韧性,从而改善高温力学性能,提高高温组织稳定性,以达到提高高温使用温度的目的。
The thermomechanical treatment for China low activation martensitic steel was carried out on a Gleeble3500 thermal simulated test machine at the deformation temperature of 850 ℃,deformation of 15%-60% and strain rate of 10 s^-1. The influence of deformation on microstructure of the steel was studied. The results show that the grain of the steel is obviously refined after thermomechanical treatment,when the deformation is 60%,the average size of the crystal grain of the steel has the smallest value of 5 μm. At the same time,With the increasing of deformation,the martensite lath of the steel tends to be refined,and high density dislocation occurs inside martensite lath,which provides a favorable position for nucleation of nanocrystalline carbonitride MX phase and promotes the precipitation of MX nanocrystalline particles. When the deformation is 60%,the content of nanocrystalline particles MX phase of the steel is the most,which hinders the slip of dislocation,pinning dislocation,playing the role of precipitation strengthening,at the same time,the steel has good toughness,so as to improve the mechanical properties at high temperature and the stability of microstructure at high temperature,so as to increase the use temperature at high temperature.