Optimum heat treatment process of Cu-Ni-Sn alloy by orthogonal test

doi:10.13251/j.issn.0254-6051.2021.03.012

Abstract

Abstract: Effect of pre-deformation and aging processes on mechanical properties of a new Cu-Ni-Sn alloy (in solid solution state) were studied by using orthogonal test, and the optimum process parameters were obtained by orthogonal range analysis. The results show that the factors affecting the hardness of the Cu-Ni-Sn alloy are: aging temperature>pre-deformation amount>aging time, the factors affecting the tensile strength of the alloy are: pre-deformation amount>aging time>aging temperature, and the factors affecting the percentage elongation after fracture of the alloy are: aging temperature>pre-deformation amount>aging time. Therefore, the optimum process is determined as: aging temperature 360 ℃, aging time 5 h and pre-deformation amount 40%. In addition, with the increase of aging temperature and pre-deformation, the tensile fracture morphologies of the alloy changes from ductile fracture with a large number of dimples to quasi-cleavage fracture with river-like morphologies, and then to intergranular brittle fracture, indicating that the plasticity of the alloy gradually decreases.

Key words: Cu-Ni-Sn alloy, orthogonal test, mechanical properties, heat treatment process

CLC Number:

TG156.92

Li Jian, Feng Zaixin, Zuo Sen, Yao Yukang, Guo Xiaosen. Optimum heat treatment process of Cu-Ni-Sn alloy by orthogonal test[J]. Heat Treatment of Metals, 2021, 46(3): 61-66.

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