Effect of homogenizing temperature on microstructure and mechanical properties of K465 superalloy

doi:10.13251/j.issn.0254-6051.2022.01.028

Abstract

Abstract: Effect of homogenizing temperature on microstructure and mechanical properties of K465 nickel-based superalloy was studied by microstructure observation and mechanical properties tast of the K465 alloy homogenized at different temperatures. The results show that when homogenized at 1160 ℃, the size of γ′ phase is larger than that of the as-cast. When homogenized near the solid solution temperature of γ′ phase (1210 ℃), the volume fraction of γ′ in the alloy is approximately 54% with uniform size and high cube degree. The γ′ is dispersed and distributed in the form of small particles, and a cellular structure appears in the microstructure homogenized at 1260 ℃. The dendrite segregation of the alloy decreases and the carbides gradually change from a developed framework to short rods and blocks as the homogenizing temperature increases. The alloy has the best comprehensive properties when homogenized at 1210 ℃ for 4 h.

Key words: K465 alloy, homogenization temperature, microstructure, mechanical properties

CLC Number:

TG113.25

Wang Shusen, Wang Zhenjiang, Gao Mingyuan, Chai Hongyu, Cao Xi, Sang Zhiru. Effect of homogenizing temperature on microstructure and mechanical properties of K465 superalloy[J]. Heat Treatment of Metals, 2022, 47(1): 167-171.

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