Microstructure and Tensile Properties of Ultrafine-Grained Ni-Based Alloy Prepared by Severe Deformation Rolling

ZHAO Xin; SHAN Aidang

doi:10.11973/jxgccl201707015

Materials and Mechanical Engineering > 2017 > 41(7): 76-79,84. > DOI: 10.11973/jxgccl201707015

ZHAO Xin, SHAN Aidang. Microstructure and Tensile Properties of Ultrafine-Grained Ni-Based Alloy Prepared by Severe Deformation Rolling[J]. Materials and Mechanical Engineering, 2017, 41(7): 76-79,84. DOI: 10.11973/jxgccl201707015

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Microstructure and Tensile Properties of Ultrafine-Grained Ni-Based Alloy Prepared by Severe Deformation Rolling

ZHAO Xin¹,
SHAN Aidang²

1. Special Steel Technology Center, Baosteel Co., Ltd., Shanghai 200940, China;
2. School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200240, China

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Received Date: November 07, 2016
Revised Date: May 25, 2017

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Abstract

Ultrafine-grained Ni-based alloy was prepared by 98% severe deformation with combination of asymmetric-rolling and symmetric-rolling. The microstructure and tensile properties of the alloy after annealing were studied. The results show that the structure of Ni-based alloy was significantly refined after rolling and the grain size was less than 200 nm and 300 nm after annealing at 700℃ and 800℃, respectively. It was found that the ultrafine-grained Ni-based alloy had a good structure stability. The strength of Ni-based alloy was significantly improved after rolling and remained very high after annealing at 700℃ and 800℃. Especially after annealing at 700℃, the yield strength and tensile strength were increased from 243 MPa and 679 MPa to 1 907 MPa and 1 949 MPa, respectively. The strength improvement and good structure stability of ultrafine grain Ni-based alloy were mainly attributed to a large amount of uniformly dispersed nano-sized γ' phase that precipitated during annealing process.
- ultrafine-grained Ni-based alloy,
- severe deformation rolling,
- microstructure,
- tensile property

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