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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Effect of thermal treatment on the fatigue crack propagation behavior of a new Ni-base superalloy
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Effect of thermal treatment on the fatigue crack propagation behavior of a new Ni-base superalloy

机译：热处理对新型镍基高温合金疲劳裂纹扩展行为的影响

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摘要

The effect of various thermal treatments, including direct aging, pre-treatment, and long-term exposure, on the hold-time fatigue crack propagation behavior of 718Plus alloy were investigated and the results are summarized as follows: (1) The hold-time fatigue crack propagation rates (FCPRs) of the direct aged (DA) sample is almost the same as that of the 718Plus alloy after conventional solution plus age heat treatment. The FCP of the DA sample is slower than the conventional 718Plus alloy at 650 ℃, under 3S loading condition; (2) the long-term exposure tests show that the alloy's hold-time fatigue crack resistance is improved after being exposed at 760 ℃ for 350 h; (3) the fine-grain alloy shows better hold-time FCP resistance than coarse-grain alloy, which is attributed to the 8-phase effect; and (4) after pre-treatment at 857 ℃ for up to 24 h, the alloy's fatigue crack resistance is improved because of the 8-phase at the grain boundaries.
机译：研究了直接热处理，预处理和长期暴露等各种热处理对718Plus合金的保持时间疲劳裂纹扩展行为的影响，结果总结如下：（1）保持时间经过常规固溶加时效热处理后，直接时效（DA）样品的疲劳裂纹扩展速率（FCPR）几乎与718Plus合金相同。在3S加载条件下，DA样品的FCP在650℃时比常规718Plus合金慢。 （2）长期暴露试验表明，该合金在760℃下暴露350 h后，其耐疲劳疲劳开裂性能得到改善。 （3）细晶粒合金表现出比粗晶粒合金更好的保持时间FCP抵抗力，这归因于8相效应。 （4）在857℃进行了长达24小时的预处理后，由于晶界处出现了8相，合金的抗疲劳裂纹性能得到了提高。

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