Transactions of Materials and Heat Treatment

Title：Study on microstructure and properties of shaped ring parts for super alloy GH4738

Authors： Wang Dan Liu Zhi Wang Jianguo Zhao Xingdong Wang Haiping Hu Yang Liu Dong He Tao

Unit： AECC Shenyang Liming Aero Engine Co. Ltd. Wuxi Paike New Materials Technology Co. Ltd. Northwestern Polytechnical University

KeyWords： super alloy GH4738 shaped ring part microstructure mechanical properties rolling temperature

ClassificationCode：TG316

year,vol(issue):pagenumber：2020,45(5):128-132

Abstract：

The forming process of shaped ring part for super alloy GH4738 was numerically simulated by the finite element method, and the microstructure and properties of shaped ring part were characterized under two schemes of pre-rolling and final rolling at 1060 ℃ and pre-rolling and final rolling at 1080 ℃, respectively. The results show that the distribution of equivalent strain for the whole ring part varies along the axial gradient, but the uniformity of equivalent strain distribution is lower to make the ring form difficultly. However, the method of pre-rolling and final rolling at 1080 ℃ is more conducive to obtaining uniform microstructure, and the equivalent strain required to obtain uniform microstructure at this temperature is no more than 0.5. Furthermore, the tensile strength, plasticity and creep properties under two schemes are basically the same, and the yield strength at room temperature under 1080 ℃ is slightly lower, while the yield strength at high temperature is higher, and the stress rupture property is 1.8 times of that at 1060 ℃. Therefore, under the condition that the equivalent strain of rolling is no less than 0.5 and the scheme of pre-rolling and final rolling at 1080 ℃ is adopted, the shaped ring part of super alloy GH4738 is rolled, and the uniform microstructure is obtained to help to improve the stress rupture property of ring parts.

Funds：

中央高校基本科研业务费专项资金项目（3102019 ZX004）

王丹（1979-），男，学士，高级工程师，E-mail：2316634121@qq.com；通讯作者：王建国（1987-），男，博士，助理研究员，E-mail：jianguow@nwpu.edu.cn

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