Thermal process matching of single crystal double casting guide vane of DD5 alloy

doi:10.13251/j.issn.0254-6051.2022.06.003

Abstract

Abstract: Thermal process sequence of single crystal double casting guide vane of DD5 alloy on microstructure and properties was studied. The results show that the microstructure of the DD5 alloy after standard heat treatment is composed of carbides, residual eutectic and regular γ' phase. Compared with that after standard heat treatment, the morphology and size of carbides welded before or after aging have no obvious change, while the size of γ' phase and γ matrix channel are not evenly distributed. The cubic shape degree of γ' phase decreases, the serrated γ'/γ phase interface can be seen, and the fine secondary γ' phase is precipitated in the γ matrix channel. Compared with that welding after aging, when welding before aging, the serrated degree of γ'/γ phase interface is slight and cubic shape degree of γ' phase is better, and the tensile properties at 870 ℃, stress rupture properties at 980 ℃/250 MPa and 1093 ℃/158 MPa are not influenced obviously. Considering the process arrangement of vane production, the optimum process sequence of the DD5 alloy guide vane is standard heat treatment first and then welding.

Key words: DD5 alloy, guide vane, welding, microstructure, property

CLC Number:

TG132.3

Jia Xinyun, Chen Shengping, Zong Cui, Tan Yongning, Huang Zhaohui. Thermal process matching of single crystal double casting guide vane of DD5 alloy[J]. Heat Treatment of Metals, 2022, 47(6): 13-18.

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