Effect of solution treatment on microstructure and mechanical properties of Ni48Cr21Cu2Mo alloy

doi:10.13251/j.issn.0254-6051.2022.05.017

Abstract

Abstract: Evolution of microstructure and mechanical properties of the Ni48Cr21Cu2Mo alloy varied with solution treatment temperature were investigated by means of the material analysis simulation software (JMatPro), X-ray diffractometer (XRD) and scanning electron microscope (SEM). The calculated equilibrium phase results show that the matrix is almost γ phase when the temperature is above 990 ℃, and the Laves phase appears in the temperature range from 870 ℃ to 1008 ℃. The δ, γ′ and σ phases are precipitated when temperature below 870 ℃. The experimental results of microstructure indicate that the grain size increases and the granular phases are redissolved gradually with the increase of solution temperature. When solution treated at 1010 ℃, the microstructure is the most homogeneous and the particle phases are basically redissolved. The γ′ and γ″ phases and the granular δ and σ composite phases precipitated at grain boundaries occur after aging. The Ni48Cr21Cu2Mo alloy has excellent comprehensive mechanical properties under 1010 ℃×1 h solution treatment and 718 ℃×8 h+622 ℃×8 h aging.

Key words: high-strength corrosion resistant alloy, microstructure, heat treatment, mechanical properties

CLC Number:

TG156.2

Liu Xuan, Huang Guoping, Liu Haiding, He Qubo, Zhang Nan. Effect of solution treatment on microstructure and mechanical properties of Ni48Cr21Cu2Mo alloy[J]. Heat Treatment of Metals, 2022, 47(5): 105-110.

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