Transactions of Materials and Heat Treatment

Title：Hot deformation behavior of superalloy GH4706 for turbine disk

Authors： Zhang Senfeng1 Yang Wenbin2 Xia Yufeng2 Yang Wei1 Zheng Deyu2 Teng Haihao2 Du Xiao2

Unit：（1. National Erzhong Group Deyang Wanhang Die Forging Co. Ltd. Deyang 618000 China 2. School of Materials Science and Engineering Chongqing University Chongqing 400044 China）

KeyWords： superalloy GH4706 friction-temperature correction constitutive model hot deformation behavior dynamic recrystallization

ClassificationCode：TG132.3

year,vol(issue):pagenumber：2024,49(9):202-212

Abstract：

The hot deformation behavior of forged superalloy GH4706 was studied by a Thermomastor-type hot simulation testing machine under the deformation temperature of 850-1100 ℃ and the strain rate of 0.001-0.1 s-1. Taking into account the adiabatic temperature rise and friction effects, the friction and temperature rise corrections were applied to the true stress-true strain curve, and the correlation coefficients r and average relative error AARE of Arrhenius and Hansel-Spittel models after friction-temperature correction were compared and analyzed. The results indicate that with the decreasing of temperature and increasing of strain rate, the overall deformation resistance of forged superalloy GH4706 gradually increases, and the error caused by the friction-temperature rise effect is also relatively greater. The correlation coefficients of Arrhenius and Hansel-Spittel models are 0.970 and 0.986, the average relative errors are 13.17% and 7.83%, respectively, and the prediction accuracy of the Hansel-Spittel model is higher. The dynamic recrystallisation of superalloy GH4706 is more sensitive to the temperature, and increasing temperature is beneficial for the dynamic recrystallization of alloy, while increasing strain rate inhibits the dynamic recrystallization of alloy.

Funds：

基金项目:国家重点研发计划（2022YFB3705103）

作者简介：张森峰（1990-），男，硕士，工程师 E-mail：1247514463@qq.com 通信作者：夏玉峰(1972-)，男，博士，教授 E-mail：yufengxia@cqu.edu.cn

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