BNi71CrSi钎料钎焊Hastelloy N合金的接头组织和性能

doi:10.7527/S1000-6893.2021.25040

Abstract

Abstract: A high-quality Hastelloy N alloy brazed joint is achieved using boron-free BNi71CrSi filler alloy. The microstructure and composition of Hastelloy N alloy joints brazed at different brazing temperatures and soaking time are investigated by the Scanning Electron Microscope (SEM) and Energy Dispersive Spectrometer (EDS). Results show that the Hastelloy N alloy joints can be divided into base metal/diffusion zone/isothermal solidification zone/athermal solidification zone/isothermal solidification zone/diffusion zone/base metal. The athermal solidification zone is mainly consisted of γ-Ni solid solution (γ-Ni(s,s)), silicide (Ni₂Si) and carbide (M₆C)(M=Ni,Mo,Si,Cr). The isothermal solidification zone is mainly composed of γ-Ni(s,s). M₆C is precipitated in the diffusion zone between the base metal and isothermal solidification zone. With the increase in brazing temperature and soaking time, the width of athermal solidification zone is decreased, whereas the width of isothermal solidification zone was increased. The constitution of the joints was changed from three zones (without isothermal solidification zone) → four zones → three zones (without athermal solidification zone). As the brazing temperature increased, the number of silicides in the brazing joint decreased, while the grains of γ-Ni(s,s) grew larger. With the extension of the soaking time, the number of silicides and M₆C in the center of joint is decreased, while the carbides in the diffusion zone between the base metal and the isothermal solidification zone were increased and coarsened. Within the brazing conditions investigated, the highest shear strength of the joint is 643.3 MPa obtained at 1 240℃ for 10 min, which is 87.4% of the shear strength of base metal; all the brazed joints presented a brittle fracture mode during shear testing.

Key words: Hastelloy N alloy, brazing, BNi71CrSi filler alloy, microstructure, mechanical property

CLC Number:

V261.3⁺4

LU Chuanyang, CHEN Gangqiang, TANG Xiatao, HE Yanming, YANG Jianguo, ZHENG Wenjian, MA Yinghe, LI Huaxin, GAO Zengliang. Microstructure and mechanical properties of Hastelloy N superalloy joints brazed using BNi71CrSi filler alloy[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(2): 625040-625040.

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Microstructure and mechanical properties of Hastelloy N superalloy joints brazed using BNi71CrSi filler alloy

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