Transactions of Materials and Heat Treatment

Title：Modified forging process of superalloy IN718 for gas turbine

Authors： Liu Yang1 Sun Chaoyuan1 2 Xiao Shi1 Xie Jing1 Liao Jia1 Liu Dejian1

Unit： 1. China National Erzhong Group Deyang Wanhang Die Forging Co. Ltd. 2. Chongqing Key Laboratory of Advanced Mold Intelligent Manufacturing College of Materials Science and Engineering Chongqing University

KeyWords： superalloy IN718 near-cast ingot thermal deformation parameters upsetting and pulling gas turbine disk

ClassificationCode：TG316

year,vol(issue):pagenumber：2023,48(3):11-19

Abstract：

In order to explore the manufacturing process and quality control points of superalloy IN718 for large gas turbine disk forgings, Φ450 mm large size superalloy IN718 near-cast ingot which was manufactured by VIM+VAR was forged with different thermal deformation parameters such as deformation temperature, forging times and sheathing methods and made into forgings. After solution+aging heat treatment, the forgings were studied by water immersion ultrasonic detection, optical metallographic examination and tensile test at room temperature. The test results show that for the ultra-sized superalloy IN718 near-cast ingot material, repeated upsetting and pulling by heating at 1080-1010 ℃ can significantly improve the deformation of upper and lower end faces of forgings, reduce the noise level during ultrasonic testing, obtain an equiaxed fine-grain structure and eliminate directionality of the δ phase, and the comprehensive mechanical properties of the forgings are the best. During upsetting and pulling, attention should be paid to reducing the heat transfer between blank and flat anvil, and avoiding the appearance of individual unrecrystallized and elongated crystals along the deformation direction.

Funds：

作者简介：刘洋（1987-），男，硕士，高级工程师 E-mail：229212501@qq.com 通信作者：孙朝远（1986-），男，博士研究生，高级工程师 E-mail：cysun316@163.com

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