窦强将,赵子华,聂宝华,马婧,刘柯军,张峥

• 1:北京航空航天大学材料科学与工程学院
• 2:中国第一汽车集团公司技术中心基础部

摘要(Abstract)：

利用超声疲劳试验方法研究了不同回火温度对汽车轴用42CrMo调质钢疲劳性能的影响以及其裂纹萌生机理。结果表明,42CrMo调质钢的疲劳S-N曲线在106~109cyc范围内存在平台,490℃回火后109cyc的疲劳极限为600 MPa,520℃回火后109cyc的疲劳极限为550 MPa。SEM断口观察表明42CrMo钢在高应力水平下疲劳裂纹倾向于在表面萌生,应力在疲劳极限附近疲劳裂纹倾向于在内部Al2O3夹杂处萌生,疲劳后材料中的碳化物明显增加。TEM结果显示经过疲劳后屈氏体中板条的尺寸从原始的237 nm降低为138 nm。同时定量分析了夹杂尺寸与疲劳极限和疲劳寿命的关系。

关键词(KeyWords)： 42CrMo钢;回火温度;超高周疲劳;Al2O3夹杂

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 窦强将,赵子华,聂宝华,马婧,刘柯军,张峥

DOI: 10.13289/j.issn.1009-6264.2014.s1.032

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