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金属学报  2004 

42CrMoVNb细晶高强钢的疲劳行为

, PP. 367-372

Keywords: 42CrMoVNb高强钢,晶粒细化,疲劳强度

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Abstract:

研究了不同热处理制度下得到的3种晶粒尺寸的42CrMoVNb细晶高强钢的疲劳性能.结果表明,它们的光滑疲劳试样S--N曲线在106---107周期范围内无平台出现,疲劳极限消失.SEM断口观察表明,光滑试样疲劳裂纹起源位置与寿命长短密切相关,测量了长寿命试样疲劳断裂源夹杂物的位置及尺寸.通过对实验数据的初步分析,给出了夹杂物及奥氏体晶粒尺寸应控制的水平.

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