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对三炉调质的2．25Cr-1Mo钢进行了高温疲劳试验。采用与参照数据对比的手法,研究了不同炉号、热处理和试验条件,例如试验温度,应变速率和应变控制方式对高温疲劳寿命的影响。所获结果如下:1)经调质的2．25Cr-1Mo钢的不同炉号几乎不影响高温疲劳寿命。2)退火的和调质的2．25Cr-1Mo钢之间在疲劳寿命方面几乎无差异。3)10-3-10-2／s之间的应变速率对2．25Cr-1Mo钢的高温疲劳寿命几乎无影响。4)应变控制方式和试验温度影响疲劳寿命。在这种情况下,应变控制方式是轴向和径向的。5)根据这些结果,供核部件用的2．25Cr-1Mo钢的ASME疲劳设计曲线对于每一温度下轴向应变控制试验数据来说并不保守。建议对调质2．25Cr-1Mo钢采用修正过的设计曲线。
High-temperature fatigue test was carried out on the 2.25Cr-1Mo steel quenched and tempered in the three furnaces. Compared with the reference data, the effects of different heat number, heat treatment and test conditions such as test temperature, strain rate and strain control method on fatigue life at high temperature were studied. The results obtained are as follows: 1) The heat-treated 2.25Cr-1Mo steel furnace number almost does not affect the high-temperature fatigue life. 2) There is almost no difference in fatigue life between annealed and tempered 2.25Cr-1Mo steels. 3) The strain rate between 10-3-10-2 / s has almost no effect on the high-temperature fatigue life of 2.25Cr-1Mo steels. 4) strain control and test temperature affect the fatigue life. In this case, the strain control mode is axial and radial. 5) Based on these results, the ASME fatigue design curves of 2.25Cr-1Mo steels for nuclear components are not conservative for the axial strain control test data at each temperature. It is recommended that the modified design curve be used for quenched and tempered 2.25Cr-1Mo steels.