采用旋转弯曲疲劳和疲劳裂纹扩展实验研究一种新型Cr-Mo-V系高强度钢在不同回火温度下的疲劳破坏行为.结果表明,Cr-Mo-V系高强度钢的旋转弯曲疲劳极限σ-1与抗拉强度Rm的比值σ-1/Rm随回火温度的升高而增加.在相同的强度水平下,实验钢的疲劳极限高于商业42CrMo钢.对疲劳断口裂纹源的分析表明,实验钢的疲劳裂纹主要起源于钢中的非金属夹杂物.采用C-T试样测定疲劳裂纹扩展速率的实验结果表明,Cr-Mo-V系高强度钢疲劳裂纹扩展第二阶段的扩展速率随回火温度升高而有所降低.在1500 MPa强度水平下,实验钢的疲劳裂纹扩展速率低于42CrMo钢.
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