Effect of hot isostatic pressing on microstructure of nickel-based superalloy K4125

doi:10.13251/j.issn.0254-6051.2022.07.012

Abstract

Abstract: Microstructure evolution of nickel-based superalloy K4125 was studied by hot isostatic pressing (HIP) with three different sets of parameters. The results show that the distribution areas of Hf, Mo and other elements in MC carbide are slightly different in the alloys prepared by three HIP. Ta, Mo, Co, Cr, Ti and Al are positive segregation elements, while W and Ni are negative segregation elements. Compared with other elements, the segregation degree of Ni, Co and Cr is smaller, and with the increase of HIP temperature and pressure, the segregation degree of all elements decreases, and the content of γ/γ′ eutectic decreases gradually. Meanwhile, the size of γ′ phase decreases significantly while its area fraction has no obvious change. In addition, the fragmentation of massive MC carbides, the precipitation of secondary MC carbides and the appearance of fine carbides at grain boundaries are observed in all the three HIP alloys. This phenomenon is intensified when the temperature and pressure are increased, and the contents of Ta and Ti in carbides decrease, while the decomposition tendency of TaC and TiC increases.

Key words: nickel-based superalloy K4125, hot isostatic pressing, microstructure

CLC Number:

TG132.3⁺2

Zhang Mingjun, Li Yuan, Li Xianghui. Effect of hot isostatic pressing on microstructure of nickel-based superalloy K4125[J]. Heat Treatment of Metals, 2022, 47(7): 71-75.

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