李永德,郭卫民,徐娜,吴晓峰,时军波,马虹

• 1:山东科学院山东省分析测试中心
• 2:山东省材料失效分析与安全评估工程技术研究中心

摘要(Abstract)：

利用超声疲劳低-高应力两步变幅加载技术研究了JIS SUJ2高强轴承钢疲劳断口上GBF(granular bright facet)内裂纹萌生与扩展规律。结果表明,随外加应力幅增加GBF尺寸减小,固定应力幅下的GBF尺寸为恒定值,与夹杂物尺寸无关;且在固定应力幅下,N f∝A槡inc-8,疲劳寿命N f随着夹杂物尺寸的增加而降低。研究表明,GBF形成于疲劳初期(在105周次左右,相应于小于1%的总寿命),随循环周次的增加,GBF尺寸基本不增加,直至接近最终疲劳寿命时(超过90%总寿命)GBF裂纹快速扩展直到最终尺寸。

关键词(KeyWords)： 轴承钢;超高周疲劳;夹杂物;颗粒状亮区;变幅加载

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51101094);; 山东省科学院科技发展基金项目(2011-4)

作者(Author): 李永德,郭卫民,徐娜,吴晓峰,时军波,马虹

DOI: 10.13289/j.issn.1009-6264.2014.01.010

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