Abstract
The heat treatment process is one of the keys factors for the microstructure and mechanical properties of superalloys, while there are few reports on the heat treatment of DZ406 alloy. In this paper, three different solution heat treatment processes were used to study the microstructure and stress rupture properties. DZ406 alloy contains γ’ phase, γ/γ’ eutectic and carbides in the as-cast state. After the heat treatment at 1265, 1275 and 1285 °C, the γ’ phase changed to be cubic shape, and the eutectic structure is reduced to 12.46, 6.27 and 5.8%. The stress rupture test indicates that the crack originates from the interfaces of carbide/matrix and γ/γ’ eutectic/matrix. With the increase of temperature of solution heat treatment, the content of γ/γ’ eutectic decreased, and resulting the gradually increased stress rupture properties.
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