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首页> 外文会议>Symposium on Creep Deformation and Fracture, Design, and Life Extension; 20050925-28; Pittsburgh,PA(US) >Hold-Time Effect on the Elevated-Temperature Crack Growth Behavior of HAYNES~reg; 230 and HASTELLOY~reg; X
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Hold-Time Effect on the Elevated-Temperature Crack Growth Behavior of HAYNES~reg; 230 and HASTELLOY~reg; X

机译：保持时间对HAYNES〜®230和HASTELLOY〜®X的高温裂纹扩展行为的影响

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摘要

The fatigue crack growth behavior of Ni-based HAYNES 230 and HASTELLOY X alloys was studied at 816 and 927℃ in lab air. The fatigue crack-growth tests were conducted following a baseline triangular waveform of 0.33 Hz. Various hold times were introduced at the maximum load to study the hold time effect. Fracture mechanics parameters, K, C~*, C_t, and (C_t)_(avg), were applied to correlate the crack growth rates. For both alloys, the fatigue-cracking path was mainly transgranular at 816 and 927?. The cracking path became dominantly intergranular if the hold time increased to 2 min, indicating that the time-dependent damage mechanisms, creep and/or oxidation, were in control. When the time-dependent damage dominated (temperature ≥ 816℃ and hold time ≥ 2 min), the crack-growth rates can be correlated with C_t or (C_t)_(avg) parameters. The C_t and (C_t)_(avg) parameters were capable of consolidating data from different temperatures and different alloys.
机译：研究了镍基HAYNES 230和HASTELLOY X合金在816和927℃的实验室空气中的疲劳裂纹扩展行为。疲劳裂纹扩展测试是在0.33 Hz的基线三角波形之后进行的。在最大负载下引入了各种保持时间，以研究保持时间的影响。应用断裂力学参数K，C〜*，C_t和（C_t）_（avg）来关联裂纹扩展速率。对于这两种合金，疲劳裂纹的路径主要是在816和927°？处的晶界。如果保持时间增加到2分钟，则开裂路径将成为主要的晶间路径，这表明与时间有关的损伤机制蠕变和/或氧化受到控制。当随时间变化的损伤占主导地位时（温度≥816℃，保温时间≥2min），裂纹扩展速率可以与C_t或（C_t）_（avg）参数相关。 C_t和（C_t）_（avg）参数能够合并来自不同温度和不同合金的数据。

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