激光沉积修复GH738/K417G合金时效热处理组织性能分析

doi:10.11896/cldb.23110265

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Abstract GH738 powder was used to carry out laser deposition repair tests on K417G alloy substrate, and the effect of aging heat treatment temperature on the microstructure and properties of laser deposition repair of GH738/K417G alloy was investigated. The results showed that the microstructure of the areas in both deposition state and heat treatment state repair zone was dominated by epitaxial columnar dendrites, and the size of dendrites increased with the increase of aging temperature, and an obvious equiaxial crystal boundary was formed at the top of the repair zone in the heat treatment state. The size of γ′ phase and the continuity of M₂₃C₆-type carbides in the repaired zone after heat treatment both increase with the aging temperature. Under a primary aging temperature of 880 ℃, the average size of the γ′ phase increases significantly, and fine M₂₃C₆-type massive carbides at the grain boundaries precipitate continuously, and has a tendency to transform into a encapsulation-like shape. Compared with the deposition state, the microhardness of the repaired area in the the heat treatment state is significantly increased, and which is higher than the hardness of the substrate also. The friction coefficient is much lower than that of the repaired areas in the depositional state, and the wear mechanisms is dominated by minor abrasive wear and oxidative wear.

Key words： laser technology GH738 alloy K417G alloy laser deposition repair microstructure friction and wear properties aging heat treatment

Published: 10 February 2025 Online: 2025-02-05

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TN249

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	Articles by authors
	BIAN Hongyou
	LIU Jinsheng
	LIU Weijun
	ZHANG Guangtai
	YAO Jiabin
	XING Fei

Cite this article:

BIAN Hongyou,LIU Jinsheng,LIU Weijun, et al. Analysis of Microstructure and Properties of GH738/K417G Alloy by Laser Deposition Repair by Aging Heat Treatment[J]. Materials Reports, 2025, 39(3): 23110265-6.

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http://www.mater-rep.com/EN/10.11896/cldb.23110265 OR http://www.mater-rep.com/EN/Y2025/V39/I3/23110265

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