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Microstructural evolution of a nickel-base single-crystal superalloy during high-temperature homogenisation
Materials Science and Technology ( IF 1.8 ) Pub Date : 2020-12-03 , DOI: 10.1080/02670836.2020.1852514
Xiangwei Li 1 , Rengen Ding 1 , Donghui Wen 1 , Yao Wang 1 , Mingqiang Chu 1 , Li Wang 2 , Peng Zhang 1 , Shuyan Zhang 1, 3
Affiliation  

Microstructural evolution of a nickel-base single-crystal superalloy during homogenisation at ultra-high temperature has been investigated using scanning electron microscope and electron probe microanalyzer. The results show that incipient melting occurs and all γ/γ′ eutectics are re-melted into liquid after 1 h homogenisation at 1350°C. The volume fraction of IM decreases gradually with increasing homogenisation time. The IM disappears totally after 14 h homogenisation. Moreover, the formation of the TCP phase is suppressed during long-term thermal exposure at 1100°C for the reduction of element segregation, especially the segregation of refractory element Re was reduced during ultra-high-temperature homogenisation. The microstructure evolution of IM was discussed based on the element diffusion during homogenisation.

中文翻译:

镍基单晶高温合金在高温均质化过程中的显微组织演变

使用扫描电子显微镜和电子探针显微分析仪研究了镍基单晶高温合金在超高温下均质化过程中的微观结构演变。结果表明,在 1350°C 下均质化 1 小时后,发生初期熔化,所有 γ/γ' 共晶物重新熔化成液体。IM 的体积分数随着均化时间的增加而逐渐降低。均质化 14 小时后 IM 完全消失。此外,TCP 相的形成在 1100°C 的长期热暴露过程中受到抑制,以减少元素偏析,特别是在超高温均质过程中减少了难熔元素 Re 的偏析。基于均质化过程中的元素扩散讨论了 IM 的微观结构演变。
更新日期:2020-12-03
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