用紧凑拉伸试样测定了65Cr5Mo3W2VSiTi(LM2)钢不同贝氏体量和不同回火温度的M/B复相组织的疲劳裂纹扩展速率,根据试验数据估算了各工艺的疲劳门槛值。结果表明,LM2钢M/B复相组织的疲劳裂纹扩展属非连续扩展机制,疲劳裂纹微观扩展速率的计算值和宏观扩展速率的实测值相近
Determination was carried out of fatigue crack propagation rate of steel65Cr5Mo3W2VSiTi (LM2) with various bainite contents and M/B duplex structure tem-pered at various temperatures. The threshold value of fatigue for each processing was esti-mated by experimental data. The mechanism for fatigue crack propagation of M / B duplexstructure in steel LM2 seems to be non-continuous. Both calculated and measured fatiguecrack micro-propagation rates are found to be matched.
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