不同组织类型对3Cr2MnNiMo钢抛光性能的影响  

Effect of Different Microstructures on Polishing Performance of 3Cr2MnNiMo Steel

作　　者：王勇围[1] 郭强 康爱军 马党参[1] 董瀚[1] 

机构地区：[1]钢铁研究总院,北京100081 [2]抚顺特殊钢股份有限公司,辽宁抚顺113001

出　　处：《钢铁研究学报》2011年第5期24-28,共5页Journal of Iron and Steel Research

基　　金：国家科技支撑计划资助项目(2007BAE51B04)

摘　　要：800mm厚塑料模具钢3Cr2MnNiMo经调质处理后,内部组织由回火索氏体、回火下贝氏体和粒状贝氏体组成,组织不均匀是由于合金元素的微观偏析,随偏析程度的增加,局部显微硬度值增高。样品经机械抛光后表面的三维形貌显示从基体至元素偏析区表面逐步隆起;粒状贝氏体区的局部光洁度最高,回火下贝氏体最低。经高温扩散退火处理后,显微硬度均匀性显著提高。Structure of plastic mould steel 3Cr2MnNiMo with thickness 800 mm,treated by quenching and high temperature tempering,composed of tempered sorbite,tempered low bainite and granular bainite.Alloying element segregation result in inhomogeneous structure and local microhardness increase with segregation level increased.Three-dimensional map of specimen treated by mechanically-polished shows that surface rising while probe entering to segregation spot,local smoothness of granular bainite and tempered low bainite are highest and lowest respectively.Uniformity of microhardness improved significantly after high temperature diffusion annealing.

关 键 词：大模块 回火索氏体 下贝氏体 粒状贝氏体 

分 类 号：TG175[金属学及工艺—金属表面处理]