陈祯,惠卫军,王占花,张念,郝彦英

• 1:北京交通大学机械与电子控制工程学院
• 2:湖北新冶钢有限公司
• 3:河钢集团石家庄钢铁有限责任公司技术中心

摘要(Abstract)：

采用旋转弯曲疲劳实验和疲劳裂纹扩展速率实验研究了两种不同碳含量的铁素体+珠光体型非调质钢30MnVS和49MnVS的光滑样和缺口样(应力集中系数K_t=4)的高周疲劳破坏行为。结果表明,缺口对实验钢的疲劳极限具有显著的影响,30MnVS和49MnVS钢缺口样的疲劳极限较光滑样降低了约69%,呈现出较高的疲劳缺口敏感性。与49MnVS钢相比,30MnVS钢的光滑疲劳极限提高了11.0%,缺口疲劳极限提高了8.5%,但30MnVS钢的疲劳缺口敏感性及疲劳裂纹扩展速率均略高。两种实验钢的疲劳裂纹往往萌生于试样或缺口根部表面基体组织中的铁素体/珠光体边界,并优先沿着该边界扩展。实验结果及文献数据的拟合分析表明,可采用K_t的二次多项式拟合公式来简便地计算K_f值。

关键词(KeyWords)： 铁素体+珠光体型非调质钢;缺口敏感性;高周疲劳;微观组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目(2016YFB0300100)

作者(Author): 陈祯,惠卫军,王占花,张念,郝彦英

DOI: 10.13289/j.issn.1009-6264.2019-0512

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