Effect of solution treatment on microstructure of carbide in K447A superalloy

doi:10.13251/j.issn.0254-6051.2022.06.016

Abstract

Abstract: Microstructure and precipitation behavior of carbides in K447A alloy under different solution treatments were analyzed by scanning electron microscopy(SEM). The results show that primary carbides in the as-cast K447A alloy are of the MC type, in the form of blocks, skeletons and Chinese characters, and are distributed between dendrites and grain boundaries. After heat treatment, primary MC carbides are broken, and a layer of γ' phase coating layer is formed on the surface. During heat treatment, the composition of the primary MC carbides changes, and the primary carbides such as TaC, TiC, and WC are decomposed, and HfC is least affected. After heat treatment, a large number of fine and dispersed granular secondary MC carbides dominated by HfC precipitate in the interdendritic and residual eutectic regions near the primary MC carbides. When solution-treated at 1185 ℃ for 2 h and aged at 870 ℃ for 20 h, the amount of secondary MC precipitation is the largest.

Key words: K447A superalloy, carbide, solution treatment, γ' phase

CLC Number:

TG132.3⁺2

Wu Wenjin, Li Xianghui, Li Xuechen, Chen Jingyang, Tang Xin. Effect of solution treatment on microstructure of carbide in K447A superalloy[J]. Heat Treatment of Metals, 2022, 47(6): 89-92.

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