Microstructural evolution of a nickel-base single-crystal superalloy during high-temperature homogenisation

Xiangwei Li; Rengen Ding; Donghui Wen

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Microstructural evolution of a nickel-base single-crystal superalloy during high-temperature homogenisation

机译：Microstructural evolution of a nickel-base single-crystal superalloy during high-temperature homogenisation

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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 y/y' 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.

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《Materials Science and Technology: MST: A publication of the Institute of Metals》 |2020年第18期|1936-1942|共7页
作者
Xiangwei Li; Rengen Ding; Donghui Wen;
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作者单位

Centre of Excellence for Advanced Materials, Dongguan, People's Republic of China;

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原文格式 PDF
正文语种英语
中图分类工程材料学;
关键词
Superalloys; homogenisation; incipient melting; segregation; TCP phase;

Microstructural evolution of a nickel-base single-crystal superalloy during high-temperature homogenisation

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