Transactions of Materials and Heat Treatment

Title：Establishment and verification on hot working process window for superalloy GH2907

Authors： Chen Yizhe Pang Yuhua Wang Jianguo Liu Dong Wang Longxiang Wang Jianyan

Unit： School of Metallurgical Engineering Xi′an University of Architecture and Technology Northwestern Polytechnical University Guizhou Anda Aviation Forging Co. Ltd. China Aerospace Shenyang Dawn Aviation Engine (Group) Co. Ltd.

KeyWords： superalloy GH2907 hot deformation solution treatment recrystallization hot working process window

ClassificationCode：TG316.3

year,vol(issue):pagenumber：2022,47(8):224-234

Abstract：

In order to determine the optimal isothermal thermal deformation process parameters for superalloy GH2907, the microstructure evolution laws of the alloy under different thermodynamic parameters (temperature and strain) were analyzed by the near isothermal thermal compression experiment and solution experiment after hot deformation, and the hot working process window was established (recrystallized grains percentage window and grain size range window). The results show that with the increasing of deformation temperature and equivalent strain, the percentage of recrystallized grains increases, and the range of grain size increases first and decreases afterwards. With the increasing of solution temperature after forging, the grains in the microstructure are gradually homogeneous, and after the solution treatment of 1040 ℃ × 1 h, the microstructure at different equivalent strains presents a homogeneous state at the same deformation temperature. According to the hot working process window, the relatively uniform microstructure can be obtained by selecting the process parameters of high temperature and small deformation (the deformation temperature of 1020 ℃, the equivalent strain of 0.4 and the solution treatment of 980 ℃×1 h). The structure in each position of the ring part produced by simulating the ring rolling and the ring rolling experiments shows a uniform state, which verifies the accuracy of the hot working process window.

Funds：

国家自然科学基金资助项目（51504195）；陕西省重点研发项目(2017ZDXM-GY-027)

作者简介：陈益哲（1992-），男，硕士，E-mail：957698190@qq.com

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