GH4169/BNi-7钎焊接头的显微组织、力学性能和腐蚀行为

doi:10.11896/cldb.23100078

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Abstract In this work, GH4169 alloy was brazed by BNi-7 filler foil. The brazed joint consists of three zones: diffusion affected zone (DAZ), athermal solidification zone (ASZ) and isothermal solidification zone (ISZ). ISZ is mainly composed of Ni-based solid solution; ASZ is composed of both γ(Ni)+Ni₃P eutectic structure and Ni-Cr-P intermetallic compounds. The typical microstructure of the GH4169 alloy joint brazed at 980 ℃ is GH4169/γ(Ni)/γ(Ni)+Ni₃P+Ni-Cr-P/γ(Ni)/GH4169. During the brazing process, the increasing of the brazing temperature was beneficial to the diffusion of elements, which should promote the volume fraction of Ni-based solid solution and decrease that of brittle phases, and then improved the shear strength of brazed joints. When the brazing temperature was 1 020 ℃, the highest shear strength (161.35 MPa) was obtained. The fracture mode of the joint was brittle fracture, and the fracture occurred in ASZ. The electrochemical tests of joints were conducted. ISZ acted as an anode and created noticeable corrosion trenches, and the substrate and ASZ were protected as cathodes. Compared with the base metal, the corrosion resistance and the stability of the passive film of the brazed joints were reduced. The increase of the brazing temperature led to a full diffusion of anti-corrosion elements such as Cr and Mo, and a more uniform microstructure of the joint, thus improving the corrosion resistance of the joint and the stability of the passive film.

Key words： vacuum brazing Ni-based alloy BNi-7 shear strength corrosion behavior

Published: 25 December 2024 Online: 2024-12-20

CLC number:

V261.3⁺4

Fund:National Natural Science Foundation of China (52071165).

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	Articles by authors
	ZHU Kaitao
	DONG Duo
	YANG Xiaohong
	ZHU Dongdong
	WANG Xiaohong
	MA Tengfei

Cite this article:

ZHU Kaitao,DONG Duo,YANG Xiaohong, et al. Microstructure, Mechanical Properties and Corrosion Behavior of the GH4169/BNi-7 Brazed Joint[J]. Materials Reports, 2024, 38(24): 23100078-8.

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http://www.mater-rep.com/EN/10.11896/cldb.23100078 OR http://www.mater-rep.com/EN/Y2024/V38/I24/23100078

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