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通过球棒滚动接触疲劳(RCF)试验机,研究了Cr4Mo4V轴承钢在4050润滑油润滑和0.18滑滚比条件下的滚动接触疲劳和磨损性能.结果表明:Cr4Mo4V钢的应力-寿命(S-N)曲线数据分散性较大,疲劳寿命随着应力增加呈下降趋势.Cr4Mo4V钢滚动接触磨损主要为磨料磨损,黏着磨损和疲劳磨损,随着应力和时间增加磨损体积增加,滚道凹槽深度达到17μm.通过光学显微镜(OM)和扫描电子显微镜(SEM)观察试样棒剖面与滚道交界处疲劳裂纹,发现疲劳破坏类型主要有两种:起源于表面的剥落(SOF)和起源于白蚀区的剥落(WSF).通过滚道径向切割抛光酸蚀显示Cr4Mo4V钢滚动接触疲劳影响区,随着应力和循环接触次数的增加,在次表层依次发现黑蚀区(DER)、白蚀区(WEA)和蝴蝶组织(BW).表面碳化物的剥落坑,黏着磨损和疲劳磨损的凹坑导致了表面起裂、白蚀区和蝴蝶组织中的碳化物和夹杂导致微裂纹的产生,链状碳化物使裂纹往深处扩展.
The rolling contact fatigue and wear properties of Cr4Mo4V bearing steel under the condition of 4050 lubricating oil and 0.18 slip ratio were studied by the ball rolling contact fatigue tester (RCF). The results show that the stress-life (SN) curve of Cr4Mo4V steel The results show that the rolling contact wear of Cr4Mo4V steel is mainly abrasive wear, adhesive wear and fatigue wear, the wear volume increases with the increase of stress and time, and the groove depth of raceway reaches 17μm. Fatigue cracks were observed by optical microscope (OM) and scanning electron microscope (SEM). There were mainly two types of fatigue failure: SOF originated from the surface and white eclogite (WSF) .The radial erosion of the raceway shows the rolling contact fatigue zone of Cr4Mo4V steel.With the increase of the stress and the number of cyclic contact, the blackout zone (DER), white erosion zone (WEA ) And butterfly tissue (BW). Peel pits of surface carbides, pits of adhesive wear and fatigue wear resulted in surface cracking, carbides and inclusions in white etches and butterflies resulting in microcracks, and chains The depth of a crack extension carbide.