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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >High temperature low cycle fatigue behavior of Ni-base superalloy M963
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High temperature low cycle fatigue behavior of Ni-base superalloy M963

机译：镍基高温合金M963的高温低周疲劳行为

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摘要

The cyclic stress-strain response and the low cycle fatigue life behavior of solution treated Ni-base superalloy M963 were studied. Fully reversed strain-controlled tests were performed at temperature range from 700 to 950℃ in air at a constant total strain rate. The dislocation characteristics and failed surface observation were evaluated through scanning electron microscopy and transmission electron microscopy, respectively. The alloy exhibited the cyclic hardening, softening, or stable cyclic stress response, which was dependent on the temperature and total strain range. The fracture surface observation revealed that fatigue crack initiation was transgranular and closely related to the total strain range; however, fatigue crack propagation exhibited a strong dependence on testing temperature. The dramatic reduction in fatigue life and intergranular cracking observed at 900 and 950℃ were attributed to oxidation.
机译：研究了固溶处理的镍基高温合金M963的循环应力应变响应和低循环疲劳寿命行为。在空气中700至950℃的温度范围内以恒定的总应变速率进行完全反向的应变控制试验。通过扫描电子显微镜和透射电子显微镜分别评估位错特征和失效表面观察。合金表现出循环硬化，软化或稳定的循环应力响应，这取决于温度和总应变范围。断裂表面观察表明，疲劳裂纹萌生是跨晶的，并且与总应变范围密切相关。然而，疲劳裂纹扩展表现出对测试温度的强烈依赖性。在900和950℃观察到的疲劳寿命和晶间裂纹的急剧减少归因于氧化。

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