赵开礼,童锐,罗志强,张强,李建新,杨卯生,孙勇

• 1:中国航发哈尔滨轴承有限公司研发中心
• 2:钢铁研究总院特殊钢研究所
• 3:抚顺特殊钢股份有限公司技术中心

摘要(Abstract)：

采用双真空熔炼制备了8Cr4Mo4VE轴承钢并对其进行均匀化处理，以控制其碳化物的数量、大小、形态及分布。利用旋转弯曲疲劳试验测试了8Cr4Mo4VE轴承钢的旋弯疲劳性能，采用扫描电镜、体式显微镜和能谱仪等分析了其旋弯疲劳试样的断口形貌和起裂源成分。结果表明：8Cr4Mo4VE轴承钢疲劳极限达到915 MPa。断口观察表明，其疲劳损坏方式主要有表面起裂和次表面碳化物起裂。次表面碳化物起裂扩展模式有3种：碳化物起裂快速扩展断裂、碳化物起裂扩展形成鱼眼区(FIE)、碳化物萌生微裂纹形成光学黑区(Optical dark area, ODA)后扩展形成鱼眼区。碳化物周围萌生裂纹及扩展时其扩展速率da/dN同应力强度因子ΔK满足Forman公式。碳化物应力强度因子ΔK_(carb)远小于光学黑区应力强度因子ΔK_(ODA)时，碳化物周围出现ODA,其裂纹扩展速率约为(1.84～2.10)×10~(-12) m/cycle。8Cr4Mo4VE轴承钢中的碳化物形状及所受应力对其疲劳寿命循环次数具有显著影响。

关键词(KeyWords)： 8Cr4Mo4VE轴承钢;旋弯疲劳;碳化物;应力

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 赵开礼,童锐,罗志强,张强,李建新,杨卯生,孙勇

DOI: 10.13289/j.issn.1009-6264.2020-0152

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