摘要
在平面磨床上对40Cr钢进行了磨削淬硬处理，研究了磨削淬硬层的组织、耐磨性和磨损机理。结果表明，40Cr钢磨削淬硬层主要由板条马氏体和孪晶马氏体组成，位错密度较高；淬硬层显微硬度高达670HV0．5，且存在残余压应力。与调质态基体相比，磨削淬硬层的耐磨性提高6～11倍；在干摩擦条件下，磨削淬硬层的磨损机理主要为磨粒磨损和氧化磨损。
40Cr steel was grind-hardened on a plane grinder. The microstructure,wear resistance and wear mechanism of the grind-hardened layer were studied. The results indicate that the grind-hardened layer consists of the lath martensite and twin martensite, dislocation density is higher in the lath martensite. The microhardness is up to 670 HV0. 5 and the compressive residual stresses are existing in the grind-hardened layer. Compared with the matrix, the wear resistance of the grind-hardened layer for 40Cr steel is increased by 6 - 11 times. The wear mechanisms of the grind-hardened layer are characterized abrasive and oxidation under dry sliding conditions.
出处
《金属热处理》
CAS
CSCD
北大核心
2008年第2期88-90,共3页
Heat Treatment of Metals
基金
福建省自然科学基金项目(E0640011)
福建省教育厅科技项目(JA07144)
集美大学优秀青年骨干教师基金项目(2006B004)
关键词
磨削加工
表面淬火
显微组织
残余应力
耐磨性
磨损机理
grinding
surface hardening
microstructure
residual stress
wear resistance
wear mechanism
