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首页> 外文期刊>Journal of Materials Engineering and Performance >Gamma Prime Stability in Haynes 282: Theoretical and Experimental Considerations
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Gamma Prime Stability in Haynes 282: Theoretical and Experimental Considerations

机译：Haynes 282中的伽玛素稳定性：理论和实验考虑

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摘要

The life cycle requirements for advanced Ni alloys are very demanding and can be on the order of several hundreds of thousands of hours. Results are presented on a wrought Ni-based superalloy designed within the nominal chemistry range of Haynes 282 with a fixed amount of gamma' strengthening phase, and either low Al or Ti (within the alloy specification) to give different ratios of Ti/Al, and thus, different gamma' misfit with the gamma matrix. The effect that these changes have on the gamma' misfit and its relevance to long-term microstructural stability is being explored both experimentally as well as with computational modeling with results through almost 10,000 h. The basics of the modeling approach are presented as are the procedures for evaluating the gamma' volume fractions from transmission electron microscopy (TEM) micrographs and correcting these volume fractions for truncation error due to TEM foil thickness. Results on each alloy formulation are compared and discussed with respect to possible gamma' coarsening due to the different Ti/Al ratio and what this might mean for the long-term stability of the alloy.
机译：先进的镍合金的生命周期要求非常高，可能需要数十万小时。结果显示在锻造的镍基高温合金中，该合金在Haynes 282的标称化学范围内设计，具有固定量的γ'强化相，并且含有低Al或Ti（在合金规格范围内）以提供不同的Ti / Al比。因此，不同的伽玛与伽玛矩阵不匹配。这些变化对伽马失配及其与长期微观结构稳定性的关系的影响正在通过实验以及计算模型进行探索，其结果持续了将近10,000小时。介绍了建模方法的基础，以及通过透射电子显微镜（TEM）显微照片评估γ体积分数并针对这些误差对TEM箔厚度造成的截断误差进行校正的过程。针对每种合金配方的结果进行了比较和讨论，探讨了由于不同的Ti / Al比而可能导致的γ'粗化以及这对于合金的长期稳定性的意义。

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