深氮化硬化32Cr3MoVE钢组织性能研究  

Microstructure and Properties Study of 32Cr3MoVE Deep Nitrided Steel

作　　者：江志华[1] 李志明[1] 佟小军[1] 李志[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《航空材料学报》2010年第2期30-34,共5页Journal of Aeronautical Materials

摘　　要：针对深氮化硬化32Cr3MoVE钢进行了硬化层组织性能的表征分析。与18CrNi4A钢渗碳件、32Cr3MoVE钢常规氮化件进行了接触疲劳性能对比试验研究,并对深氮化件进行了接触疲劳失效行为分析,认为两种裂纹萌生模式同时存在,但其疲劳破坏取决于表层内裂纹的萌生和扩展。同时探索了深氮化硬化钢长寿命机理:渗氮层深达0.6～0.8mm,渗层组织优异,表面硬度高,具有优异的硬度梯度和残余应力分布。The microstructure and property of 32Cr3MoVE deep nitrided steel were characterized and analyzed. The contact fatigue experimental study was carried out for 32Cr3MoVE deep nitrided steel and for presenting a striking contrast,we also carried out aimultaneously the same contact fatigue experiment for the 18CrNi4A carburized steel and 32Cr3MoVE conventional nitrided steel. The failure morphology analysis for 32Cr3MoVE deep nitrided steel showed that two modes of fatigue crack formation worked,but the fatigue failure was mainly due to the formation and expansion of subsurface cracks. 32Cr3MoVE deep nitrided steel＇s long-life Mechanism was explored as follows：deep nitriding process leads to a case depth between 0.6mm and 0.8mm,a high surface hardness,superior case microstructure,favorable hardness gradient and excellent distribution of residual compressive stresses.

关 键 词：深氮化硬化32Cr3MoVE钢 接触疲劳 渗层组织 硬度梯度 残余应力分布 失效行为 

分 类 号：TG146.21[一般工业技术—材料科学与工程]