The Role of Solidified Phases on the Hot Cracking of a Large-Size GH4742 Superalloy Ingot

Author:

Zhang Liang1,Wang Lei1ORCID,Liu Yang1,Song Xiu1,Yu Teng2,Duan Ran3

Affiliation:

1. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

2. High Temperature Materials Division, Fushun Special Steel Co., Ltd., Fushun 113001, China

3. Gaona Aero Material Co., Ltd., Beijing 100081, China

Abstract

The effect of solidified phases on the hot cracking behaviour of a large-size GH4742 superalloy ingot produced using vacuum induction melting (VIM) is investigated in order to improve the quality of the final product. The results show that the solidification order of the ingot is γ matrix, MC carbide, η phase and γ′ phase. Among them, the MC carbide and the η phase solidified in the mushy zone. The volume fraction of both the η phase and the MC carbide in the cracked zone is higher than that in the non-cracked zone, and a significant number of η phases are distributed near the hot cracks. The formation of solidified phases not only induces stress concentration at η phase/γ matrix interfaces but also reduces the ability of liquid feeding during solidification, thus promoting hot crack formation. It is believed that by controlling the segregation degree of both Nb and Ti, the volume fraction of η phases and MC carbides can be reduced to prevent hot cracking of the GH4742 superalloy VIM ingot.

Funder

National Natural Science Foundation of China

Major Projects in Aviation Engines and Gas Turbines

National Key Research and Development Program of China

Publisher

MDPI AG

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