应用超声疲劳试验技术,对两种高强度钢在20 kHz频率下105～1010循环周次的疲劳性能进行了测试分析.结果表明:应力比R=-1时,D38MSV5S钢与100C6钢在105～1010循环周次之间,试样仍会发生疲劳断裂,疲劳强度随循环次数的增加而下降;R=0.1时,D38MSV5S钢在106～107循环周次之间会出现疲劳强度.与30 Hz频率下常规疲劳试验数据比较发现,频率对100C6钢的疲劳性能影响不大;R=-1时,D38MSV5S钢20kHz频率下的SN曲线略低于30 Hz频率下的S-N曲线,当R=0.1时,频率对D38MSV5S钢疲劳性能的影响更为明显.在超高周疲劳循环下,疲劳破坏主要起源于试样内部夹杂物.
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