Transactions of Materials and Heat Treatment

Title：Compound process on hot gas pressure forming and reaction preparation for NiAl alloy tubular components with variable cross-section

Authors： Liu Gang1 Wang Bao1 Wang Dongjun1 Qiu Gaosong2 Wang Zhongyao1

Unit： 1. National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of Technology 2. Beijing Power Machinery Research Institute

KeyWords： NiAl alloy Ni/Al laminated materials reaction preparation tubular components with variable cross-section hot gas pressure forming

ClassificationCode：TG394

year,vol(issue):pagenumber：2023,48(5):1-6

Abstract：

NiAl intermetallic compound has higher high-temperature strength and lower density than traditional nickel-base superalloy. Therefore, aiming at the manufacturing problems of NiAl alloy thin-walled components with variable cross-section, the composite forming process of hot gas pressure forming for Ni/Al laminated material tubular components with variable cross-section and NiAl alloy reaction preparation was carried out. Firstly, the Ni/Al laminated cylindrical billets with tight bonding between layers and high plasticity were prepared by controlling the Ni/Al interface, and the hot gas pressure forming law and micro-damage control method of Ni/Al laminated materials were studied under different process parameters. Then, the variable cross-section tubular components with good fittingness were formed. Finally, Ni/Al laminated material components were transformed into NiAl alloy components by reaction preparation. The research shows that the temperature and the gas pressure loading rate are the key parameters of hot gas pressure forming for Ni/Al laminated materials. At a reasonable temperature, adjusting the strain rate through the gas pressure loading rate can avoid the microscopic damage and control the fillet accuracy. The tensile strength of NiAl alloy thin-walled components with variable cross-section prepared by reaction preparation reaches 110 MPa at 900 ℃.

Funds：

国家自然科学基金资助项目（52175298）

作者简介：刘钢（1970-），男，博士，教授，E-mail：gliu@hit.edu.cn

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