轴承保持架软氮化针状组织的形成原因及防止措施  

Forming Causes and Prevention Measures for Acicular Structure in Bearing Cages After Nitrocarburizing

作　　者：刘斌[1,2] 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200240 [2]人本集团技术中心,上海201411

出　　处：《轴承》2013年第9期30-33,共4页Bearing

基　　金：国家"九七三"计划项目(2011CB706604)

摘　　要：常规软氮化后的轴承保持架心部容易出现针状γ'相氮化物,导致零件出现脆性断裂。采用光学显微镜(OM)和扫描电子显微镜(SEM)对试样中的针状氮化物进行组织观察和分析,并通过试验证实这种针状氮化物是在软氮化结束后由过饱和含氮α-Fe(N)中析出的,试验结果表明,降低氮化温度和软氮化结束后快速冷却均能有效防止针状氮化物的析出。The acicular nitride （γ′phase） is able to be easily formed in center area of bearing cages after traditional nitrocarburizing process, causing brittle fracture of parts. The structure of aeieular nitride in samples is observed and analyzed by using OM （Optical Microscope）and SEM （Scanning Electron Microscope） . It is confirmed that the acicular nitilde precipitates from nitrogen saturated α- Fe after nitroearburizing. The experimental results indicate that lower ni- triding temperature and quenching after nitroearburizing are two effective ways to inhibit the precipitation of acicular ni- tilde.

关 键 词：滚动轴承 保持架 气体软氮化 针状氮化物 

分 类 号：TH133.33[机械工程—机械制造及自动化] TG156.82[金属学及工艺—热处理]