Microstructure and properties of Cu-Cr-Fe-Ni alloy during thermo-mechanical heat treatment processing

doi:10.13251/j.issn.0254-6051.2020.04.017

Abstract

Abstract: Cu-0.59 Cr-0.078 Fe-0.081 Ni alloy was prepared by non-vacuum melting+hot rolling+solid solution treatment+cold rolling+aging. The effects of heat treatments and deformation processes on the microstructure, electrical conductivity and hardness of the alloy were investigated. The results show that after atmospheric melting and casting, the Cu-Cr-Fe-Ni alloy shows obvious dendritic structure. After solid solution treatment, the alloy recrystallizes, and the hardness and conductivity of it decrease correspondingly, with values of 65.9 HV0.2 and 41.7%IACS, respectively. After cold rolling, the hardness of the alloy increases significantly. When the deformation amount reaches 90%, the hardness of the alloy is as high as 144.7 HV0.2. After the deformation, the alloy hardness first increases and then decreases during the aging process at 450 ℃. When the alloy deformation is 60%, the peak aging is reached at aging 30 min, leading the hardness and conductivity to 155.5 HV0.2 and 71.4%IACS, respectively.

Key words: Cu-Cr-Fe-Ni alloy, thermo-mechanical heat treatment, microstructure, hardness, conductivity

CLC Number:

TG146.1

Jing Qingxiu, Zhang Zehui, Wang Hang, Yang Bin. Microstructure and properties of Cu-Cr-Fe-Ni alloy during thermo-mechanical heat treatment processing[J]. Heat Treatment of Metals, 2020, 45(4): 84-89.

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