16Cr3NiWMoVNbE齿轮钢的疲劳性能与裂纹萌生  

Fatigue performance and crack initiation of 16Cr3NiWMoVNbE gear steel

作　　者：李建新 罗志强[2] 程世超 杨卯生[2] 孙勇 庞学东 Li Jianxin;Luo Zhiqiang;Cheng Shichao;Yang Maosheng;Sun Yong;Pang Xuedong(Technology Center,Fushun Special Steel Group Co.,Ltd.,Fushun Liaoning 113001,China;Institute for Special Steel,Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]抚顺特殊钢股份有限公司技术中心,辽宁抚顺113001 [2]钢铁研究总院特殊钢研究所,北京100081

出　　处：《金属热处理》2020年第7期167-173,共7页Heat Treatment of Metals

摘　　要：采用真空感应熔炼+真空自耗重熔(VIM+VAR)工艺制备16Cr3NiWMoVNbE齿轮钢。测定了试验钢的疲劳极限和S-N曲线。通过观察断口,分析疲劳萌生类型和影响因素。结果表明:疲劳极限强度达到773 MPa,疲劳裂纹萌生于表面驻留滑移带、表面缺陷、近表面夹杂物和次表面夹杂物。表面驻留滑移带萌生疲劳裂纹占13%,表面缺陷萌生裂纹占33.3%,近表面夹杂物萌生占40%,次表面夹杂物萌生占13%。当疲劳裂纹萌生于内部夹杂物时,疲劳寿命随应力的增大而减小;在一定实际应力作用下,疲劳寿命随夹杂物尺寸的增大而减小。随着实际应力增加,疲劳裂纹萌生的夹杂物临界尺寸减小。Gear steel 16Cr3NiWMoVNbE was prepared by VIM+VAR process.The fatigue limit and S-N curve of the test steel were measured.The fatigue crack initiation type and influencing factors were analyzed by observing the fracture.The results show that the ultimate fatigue strength is 773 MPa,and the fatigue cracks originate from resident slip bands,surface defects,near-surface inclusions,and subsurface inclusions.Initiated fatigue cracks on the surface resident slip band account for 13%,initiation cracks on surface defects account for 33.3%,initiation of near-surface inclusions accounts for 40%,and initiation of sub-surface inclusions accounts for 13%.When fatigue cracks originate from internal inclusions,the fatigue life decreases with increasing stress;under certain actual stresses,the fatigue life decreases with increasing inclusion size.With the increase of actual stress,the critical size of the inclusions induced by fatigue cracks decreases.

关 键 词：旋转弯曲疲劳 裂纹萌生 表面形貌 非金属夹杂物 

分 类 号：TG142.71[一般工业技术—材料科学与工程]