Microstructural evolution of a nickel-base single-crystal superalloy during high-temperature homogenisation. Issue 18 (11th December 2020)

• Record Type: Journal Article
• Authors: Li, Xiangwei; Ding, Rengen; Wen, Donghui; Wang, Yao; Chu, Mingqiang; Wang, Li; Zhang, Peng; Zhang, Shuyan
• Is Part Of: Materials science and technology. Volume 36:Issue 18(2020)
• Page Start: 1936
• Page End: 1942
• Publication Date: 2020-12-11
• Subjects: Superalloys -- homogenisation -- incipient melting -- segregation -- TCP phase; Materials science -- Periodicals; Microstructure -- Periodicals; Metallurgy -- Periodicals; 620.1105
• DOI: 10.1080/02670836.2020.1852514
• Languages: English
• ISSNs: 0267-0836

Abstract

Abstract : 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.