Study on Hot Working Technology of GH4720Li Superalloy

Author of the article:TIAN Ximing1 , SHI Puying2 , LI Kun2 , SUN Xiaoping2,3, WANG Kaixuan2 , JING Jianfa2,4

Author's Workplace：1. Naval Equipment Department, Xi'an 710021, China; 2. Shaanxi Aviation Materials Engineering Laboratory, Western Superconducting Materials Technologies Co., Ltd., Xi'an 710018, China; 3. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China; 4. School of Resource Processing and Bioengineering, Central South University, Changsha 410083, China

Key Words：GH4720Li alloy; rolling deformation; bar; processing

Abstract：The precipitation law of each phase in GH4720Li alloy was analyzed from the thermodynamic point of view. According to the heat treatment test results, the appropriate processing temperature range was determined. According to the numerical simulation results of rolling process, the feasible deformation matching of rolling passes was obtained. The results show that the hot working temperature should not exceed 1 160 ℃. Under the heating condition of 1 140 ℃, the single rolling deformation is less than 30%. The grain size of the sample is 8~9 grade, and its mechanical properties meet the standard requirements.