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Creep-fatigue crack development from short crack starters

机译：短裂纹起子产生的蠕变疲劳裂纹

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A series of isothermal strain controlled creep-fatigue tests on fully instrumented cylindrical specimens with shallow chordal crack starters has been conducted for an advanced 9%Cr turbine rotor steel at 600 and 625 degrees C. Cyclic/hold wave shapes involving a dwell period at peak strain in tension or compression were also performed with crack development being monitored by means of electrical potential drop instrumentation. It is found that temperature, total strain range and hold period are the most influential factors on short creep-fatigue crack propagation rates and specimen life. In order to establish a reliable relationship to represent subcritical crack development for high temperature component integrity assessment, the effectiveness of candidate correlating parameters such as cyclic strain range, cyclic J integral and strain energy density factor have been evaluated. Their application to circumstances involving short crack development due to fatigue, and interacting and non-interacting creep loading are evaluated with reference to the evidence determined from post-test metallurgical examination.
机译：在600和625摄氏度下，针对先进的9％Cr涡轮转子钢，对带有浅弦裂纹启动器的完全仪器化的圆柱形试样进行了一系列的等温应变控制蠕变疲劳测试。循环和保持波形涉及峰值停留时间还进行了拉伸或压缩应变，并通过电势下降仪器监测了裂纹的发展。结果表明，温度，总应变范围和保持时间是影响短蠕变疲劳裂纹扩展速率和试样寿命的最主要因素。为了建立一个可靠的关系来表示亚临界裂纹的发展，以进行高温部件的完整性评估，已经评估了候选相关参数（例如循环应变范围，循环J积分和应变能密度因子）的有效性。参照从试验后的冶金检查确定的证据，评估它们在因疲劳而导致短裂纹发展以及相互作用和不相互作用的蠕变载荷的情况下的应用。

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