GCr15轴承钢的碳化物超细化  

Carbide Ultrafining in Bearing Steel GCr15

作　　者：曾伊琪 陈志辉[1] 韩利战[1] 顾剑锋[1] 

机构地区：[1]上海交通大学材料科学与工程学院上海市激光制造与材料改性重点实验室,上海200240

出　　处：《轴承》2015年第7期25-28,36,共5页Bearing

基　　金：国家"九七三"计划项目(2011CB706604);国家科技重大专项(2012ZX04012011)

摘　　要：研究了传统球化退火、固溶+高温回火、固溶+等温退火3种球化处理工艺及其对GCr15轴承钢淬回火后的组织和性能的影响。试验结果表明,固溶+高温回火和固溶+等温退火工艺均能有效细化碳化物颗粒,后者还能有效球化碳化物颗粒。球化获得的超细化碳化物能细化淬回火后原始奥氏体晶粒,获得双细化效果,提高材料硬度和弯曲强度。Three kinds of spheroidizing processes are investigated, which are conventional spheroidizing annealing, sol- id solution ＋ high temperature tempering and solid solution ＋ isothermal annealing. The influence of spheroidizing processes on structure and properties of bearing steel GCrl5 are studied after quenching and tempering process. The test results show that both the high temperature tempering and isothermal annealing after solid solution can effectively refine carbides, the latter can achieve good spheroidizing effect. The refined carbides can refine original austenite grain after quenching and tempering process, the double refining effect is achieved, and the hardness and bending strength of material are enhanced.

关 键 词：GCR15轴承钢 球化退火 高温回火 等温退火 

分 类 号：TH133.33[机械工程—机械制造及自动化] TG156[金属学及工艺—热处理]