裂纹扩展速率不仅是高温合金涡轮盘的重要使用性能,同时也是涡轮盘损伤容量设计和寿命预测的重要指标之一.总结了高温合金的裂纹扩展速率的各种影响因素,包括外部因素和内部因素两大类.外部因素指试件或构件的实验条件或服役条件,如温度、环境、频率、应力比、保载时间以及其它因素等.内部因素指材料本身所具有的状态和性能,如材料的晶粒尺寸、析出相、晶界及化学成分等.这些因素单独作用或交互作用影响高温合金裂纹扩展速率.
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