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首页> 外文OA文献 >Time-Dependent Fatigue Crack Propagation Behavior of Two Solid-Solution-Strengthened Ni-Based Superalloys—INCONEL 617 and HAYNES 230
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Time-Dependent Fatigue Crack Propagation Behavior of Two Solid-Solution-Strengthened Ni-Based Superalloys—INCONEL 617 and HAYNES 230

机译：两种固溶强化镍基高温合金的时间相关疲劳裂纹扩展行为-INONEL 617和HaYNEs 230

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摘要

The fatigue crack propagation (FCP) as well as the sustained loading crack growth (SLCG) behavior of two solid-solution-strengthened Ni-based superalloys, INCONEL 617 (Special Metals Corporation Family of Companies) and HAYNES 230 (Haynes International, Inc., Kokomo, IN), were studied at increased temperatures in laboratory air under a constant stress-intensity- factor (K) condition. The crack propagation tests were conducted using a baseline cyclic triangular waveform with a frequency of 1 3 Hz. Various hold times were imposed at the maximum load of a fatigue cycle to study the hold time effect. The results show that a linear elastic fracture mechanics (LEFM) parameter, stress intensity factor (K), is sufficient to describe the FCP and SLCG behavior at the testing temperatures ranging from 873 K to 1073 K (600 C to 800 C). As observed in the precipitation-strengthened superalloys, both INCONEL 617 and HAYNES 230 exhibited the time-dependent FCP, steady SLCG behavior, and existence of a damage zone ahead of crack tip. A thermodynamic equation was adapted to correlate the SLCG rates to determine thermal activation energy. The fracture modes associated with crack propagation behavior were discussed, and the mechanism of time-dependent FCP as well as SLCG was identified. Compared with INCONEL 617, the lower crack propagation rates of HAYNES 230 under the time-dependent condition were ascribed to the different fracture mode and the presence of numerous W-rich M6C-type and Cr-rich M23C6-type carbides. Toward the end, a phenomenological model was employed to correlate the FCP rates at cycle/time-dependent FCP domain. All the results suggest that an environmental factor, the stress assisted grain boundary oxygen embrittlement (SAGBOE) mechanism, is mainly responsible for the accelerated time dependent FCP rates of INCONEL 617 and HAYNES 230.
机译：两种固溶强化的镍基高温合金INCONEL 617（Special Metals Corporation Family of Companies）和HAYNES 230（Haynes International，Inc.）的疲劳裂纹扩展（FCP）以及持续载荷裂纹扩展（SLCG）行为。 ，位于印第安那州科科莫市（Kokomo，IN））在恒定的应力强度因子（K）条件下，在实验室空气中升高的温度下进行了研究。裂纹扩展测试是使用基线循环三角波（频率为1 3 Hz）进行的。在疲劳循环的最大负荷下施加各种保持时间，以研究保持时间的影响。结果表明，线性弹性断裂力学（LEFM）参数应力强度因子（K）足以描述873 K至1073 K（600 C至800 C）测试温度下的FCP和SLCG行为。正如在沉淀强化的高温合金中观察到的，INCONEL 617和HAYNES 230均表现出随时间变化的FCP，稳定的SLCG行为以及在裂纹尖端之前存在损坏区域。热力学方程适用于关联SLCG速率以确定热活化能。讨论了与裂纹扩展行为有关的断裂模式，并确定了时变FCP和SLCG的机理。与INCONEL 617相比，HAYNES 230在随时间变化的条件下较低的裂纹扩展速率归因于不同的断裂模式以及大量W富M6C型和Cr高M23C6型碳化物的存在。最后，采用现象学模型来关联周期/时间相关的FCP域中的FCP速率。所有结果表明，环境因素，即应力辅助晶界氧脆化（SAGBOE）机制，主要是INCONEL 617和HAYNES 230的时间依赖性FCP速率加快的原因。

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