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首页> 外文期刊>Materials at High Temperatures >Effect of Re content on precipitation behaviour of secondary phases in a single-crystal Ni-based superalloy during high-temperature thermal exposure
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Effect of Re content on precipitation behaviour of secondary phases in a single-crystal Ni-based superalloy during high-temperature thermal exposure

机译：高温热曝光期间，RE含量对单晶Ni基超合金中次级阶段沉淀行为的影响

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摘要

The precipitation of secondary phases in single-crystal Ni-based superalloys with different contents of Re are investigated using TEM and SEM.The results show that after full heat treatment, the size of secondary gamma' phase decreases gradually with increasing Re content. During long-term thermal exposure at 1093 degrees C, some needle-like and rod-like secondary phases precipitate from the gamma matrix. With increasing Re content and prolonging of the thermal exposure, the amounts of precipitated phases clearly increase. In the alloy with 2.5 wt-% Re, the needle-like phases are identified as M6C carbides. In the alloy with 3 wt-% Re, both M6C carbides and mu phase are found. In the alloy with 15 wt% Re, the needle-like and rod-like precipitated phases are identified as mu and P phases. Stacking fault was found in the P phase and that part was identified as mu phase by SAD; that is, there is intergrowth of P and mu phases.
机译：使用TEM和SEM研究具有不同含量的单晶Ni基超合金中的二次相的沉淀。结果表明，在充分热处理后，随着RE含量的增加，次级γ相的尺寸逐渐降低。 在1093℃的长期热暴露期间，一些针状和棒状的副相从γ基质沉淀出来。 随着Re含量的增加和热暴露的延长，沉淀阶段的量明显增加。 在2.5重量％Re的合金中，针状相鉴定为M6C碳化物。 在具有3wt-％Re的合金中，发现M6C碳化物和MU相。 在15wt％Re的合金中，针状和棒状沉淀的相鉴定为Mu和P阶段。 在P阶段发现堆叠故障，并且该部分被难以识别为mu相; 也就是说，存在p和mu阶段的晶间。

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