摘要
通过力学性能测试以及微观组织和疲劳断口形貌分析等系统研究了一种采用双真空冶炼的高洁净度轴承钢30Cr3WVE的高周旋转弯曲疲劳破坏特性及非金属夹杂物对其疲劳性能的影响。结果表明：30Cr3WVE轴承钢经870℃淬火和550℃回火后具有优异的综合力学性能,旋转弯曲疲劳极限强度达到732MPa;通过疲劳断口的SEM观察,疲劳裂纹起源于试样的表面缺陷和内部的非金属夹杂物。表面缺陷为非金属夹杂物脱落形成的凹坑和机加工留下的刀痕,内部非金属夹杂物主要为Al、Mg、Si和Ca的氧化物。夹杂物对30Cr3WVE轴承钢旋转弯曲疲劳极限强度的影响与其尺寸和至表面的距离密切相关。构建了夹杂物尺寸和分布对30Cr3WVE轴承钢旋转弯曲疲劳极限强度影响的模型,通过控制夹杂物尺寸和数量可显著提高该钢的旋转弯曲疲劳极限强度。
The fatigue characteristics of a high cleanliness bearing steel（30Cr3WVE）produced by double vacuum melting and the effect of non-metallic inclusions on fatigue properties were studied by mechanical analysis and SEM analysis of microstructure and fatigue fracture morphology.The results show that the 30Cr3WVE bearing steel achieves excellent mechanical properties after being quenched at 870℃and tempered at 550℃,and its ultimate rotating bending fatigue strength reaches 732 MPa.Through observing SEM results of fatigue fracture,the fatigue crack originates from the surface defects and internalnon-metallic inclusions.Surface defects are caused by the abscission of non-metallic inclusions and machining marks.The internal non-metallic inclusions are mainly oxides of Al,Mg,Si and Ca.The influence of inclusions on the ultimate bending fatigue strength of 30Cr3WVE bearing steel is closely related to its size and distance to the surface.The model of influence of the size and distribution of inclusions on the rotating bending fatigue strength of 30Cr3WVE bearing steel is constructed.The rotational bending fatigue strength of the steel can be improved remarkably by controlling the size and quantity of inclusions.
作者
王艳江
杨卯生
孙世清
张志慧
WANG Yan-jiang;YANG Mao-sheng;SUN Shi-qing;ZHANG Zhi-hui(School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050000 Hebei, China;Institute for Special Steel, Central Iron and Steel Research Institute, Beijing 100081, China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2018年第3期213-221,共9页
Journal of Iron and Steel Research
基金
国家高技术研究发展计划(863计划)资助项目(2012AA03A503)
