Transactions of Materials and Heat Treatment

Title：Rolling of oblique I-shaped ring piece for superalloy GH4706 and study on microstructure and properties

Authors： Zhou Tao1 Luo Hongfei2 Sun Yuxiang3 Lu Yi2 Wang Jianguo3 Li Changyong4 Liu Dong3

Unit： 1.Air China Shenyang Engine Research Institute 2.Guizhou Aviation Technical Development Co. Ltd. 3.Department of Materials Northwestern Polytechnical University 4.Technology Center AECC Shenyang Liming Aero Engine Co. Ltd.

KeyWords： superalloy GH4706 ring rolling oblique I-shaped ring piece microstructure mechanical properties

ClassificationCode：TG306

year,vol(issue):pagenumber：2024,49(10):99-104

Abstract：

The rolling processes of rectangular and oblique I-shaped ring pieces for superalloy GH4706 were simulated by finite element method, and the strain and temperature distributions after two types of rolling process were obtained. Then, the microstructures and mechanical properties of rectangular and oblique I-shaped ring pieces under the same nominal forming parameters were compared and analyzed. The results show that after rolling the oblique I-shaped ring piece, the equivalent strain at the inner ring of large end face is the highest, reaching six or more, and the maximum temperature difference reaches 200 ℃. However, the equivalent strain of rectangular ring piece after rolling is relatively small, with the maximum equivalent strain of only close to four and the maximum temperature difference of only 50-60 ℃. Thus, the oblique I-shaped ring piece can be formed by rolling the rectangular ring blank, but the uniformity of temperature and equivalent strain distributions is lower, making it more difficult to form compared to the rectangular ring piece. Through practical experiments, it can be verified that under the premise of ensuring performance and organizational requirements, the method of pre-rolling at 1050 ℃ + final rolling at 1030 ℃ can be used to roll superalloy GH4706 oblique I-shaped ring piece, and the actual ring forming is complete without forming defects.

Funds：

作者简介：周涛（1982-），男，硕士，高级工程师,E-mail：ztzhzya@163.com;通信作者：王建国（1987-），男，博士，助理研究员,E-mail：jianguow@nwpu.edu.cn

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