锻压技术

燃气轮机用IN718高温合金改锻工艺

英文标题：Modified forging process of superalloy IN718 for gas turbine

单位：1. 中国第二重型机械集团德阳万航模锻有限责任公司 2. 重庆大学材料科学与工程学院先进模具智能制造重庆市重点实验室

分类号：TG316

出版年,卷(期):页码：2023,48(3):11-19

摘要：

为了探索IN718高温合金大型燃气轮机轮盘锻件的制造工艺及质量控制要点，采用VIM+VAR制备的Φ450 mm大规格IN718高温合金近铸锭，进行了不同变形温度、改锻火次及包套方式等热变形参数的改锻并制成锻件，经固溶+时效热处理后通过水浸法超声波检测、光学金相检验及室温拉伸试验等方法对锻件进行研究。试验结果表明：对于超大规格的IN718高温合金近铸锭材料，通过在1080～1010 ℃加热进行反复镦拔，可明显改善锻件上、下端面的变形量，降低超声波检测时的噪声水平，获得等轴细晶组织并消除δ相的方向性，锻件的综合力学性能最优；镦拔中应注意减少坯料与平砧的传热，避免出现少数未再结晶的、顺着变形方向被拉长的扁长晶粒。

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.

基金项目：

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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