Transactions of Materials and Heat Treatment

Title：Microstructure evolution laws of multi-pass compression deformation for nickel-base superalloy GH4065A

Authors： Shui Lang1 2 Fu Jianhui1 2 Lai Yu1 2

Unit： 1. Department of Special Steel Technology Chengdu Institute of Advanced Metallic Material Technology and Industry Co. Ltd. 2. State Key Laboratory of Metal Material for Marine Equipment and Application

KeyWords： mickel-base superalloy multi-pass hot deformation cogging process coarse grains complete recrystallization

ClassificationCode：TG316

year,vol(issue):pagenumber：2023,48(3):244-254

Abstract：

The microstructure evolution of nickel-base superalloy GH4065A during the multi-pass compression deformation process using staged cooling process with different strain rates and different strain amounts was studied. The results show that by accumulating the engineering strain amount of 75% in two passes with each compression amount of 50%, a fully recrystallized and fine-grained structure close to the 70% engineering strain amount in a single pass under the same temperature range and the same strain rate can be obtained, that is, the accumulated true strain reaches above 1.39. A engineering strain amount of lower than 50% in each pass is likely to cause incompletely crystallized “necklace structure” or coarse grains. The cogging process of cast with the diameter of Φ508 mm simulated by Deform shows that the set deformation process is able to allow the central part of billet to reach the accumulated more than the equivalent strain of 1.39 and to reach complete recrystallization by two-time upsetting and two-time pulling, whereas two ends are still partially failed to reach the accumulated equivalent strain of 1.39, requiring the third deformation to achieve complete recrystallization. And, the problem of coarse grains during deformation needs to be controlled by adjusting the precipitation of γ′ phase.

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作者简介：税烺（1987-），男，博士，高级工程师 E-mail：ustb1234@126.com

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