齿轮轴纵向延迟开裂原因分析  

Failure analysis of longitudinal delayed cracking for gear shaft

作　　者：杨春[1,2] 朱衍勇[1] 钟振前[1] 司红[1] 董毅[1] 

机构地区：[1]钢铁研究总院失效分析中心,北京100081 [2]清华大学材料学院,北京100084

出　　处：《金属热处理》2013年第8期131-134,共4页Heat Treatment of Metals

摘　　要：风电用齿轮轴在最终热处理后的放置期间发生纵向开裂,本文对开裂齿轮轴的材料化学成分、力学性能、金相组织、裂纹及断口形貌进行了分析和检验。结果表明,裂纹从齿根下方的大尺寸非金属夹杂物处起裂,为残余应力作用下的氢致延迟开裂。拉应力区存在大尺寸非金属夹杂物以及热处理残余应力偏大是导致齿轮轴开裂的主要原因。Gear shafts used on wind turbine were longitudinally cracked during the storage period after the final heat treatment.Chemical composition,mechanical properties,microstructure and fracture morphology were analyzed.The result shows that it is the residual stress and hydrogen-induced delayed fracture initiated from large size inclusion under the tooth root.The presence of large size inclusion and high level residual stress are the main factors for the cracking.

关 键 词：齿轮轴 延迟断裂 非金属夹杂物 残余应力 氢 

分 类 号：TG157[金属学及工艺—热处理]