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,Nf∝√Ainc-8,疲劳寿命Nf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.
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