Cu-Cr-Fe-Ni合金形变热处理过程中的组织与性能

采用非真空熔炼并经热轧—固溶—冷轧—时效热处理工艺制备Cu-0.59Cr-0.078Fe-0.081Ni合金板,探究热处理和冷变形对合金显微组织、电导率和硬度的影响。结果表明:Cu-Cr-Fe-Ni合金大气熔铸后呈明显的枝状晶组织,经固溶处理后合金发生再结晶,硬度和电导率都相应的降低,分别为65.9 HV0.2、41.7%IACS;经过冷变形处理后合金的硬度显著提高,变形量达90%时,合金的硬度高达144.7 HV0.2;合金变形后在450 ℃时效的过程中硬度先增加后减少,变形量为60%时,时效30 min达到峰时效,此时硬度、电导率分别为155.5 HV0.2、71.4 %IACS。

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

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.