锻压技术

NiAl合金变截面管件热态气压成形-反应制备复合工艺

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

作者：刘钢1 王宝1 王东君1 邱高松2 王忠尧1

单位：1.哈尔滨工业大学金属精密热加工国家级重点实验室 2. 北京动力机械研究所

关键词：NiAl合金 Ni/Al叠层材料反应制备变截面管件热态气压成形

分类号：TG394

出版年,卷(期):页码：2023,48(5):1-6

摘要：

NiAl金属间化合物具有较高的高温强度且密度低于传统镍基高温合金，针对NiAl合金变截面薄壁构件制造难题，开展了Ni/Al叠层材料变截面管件热态气压成形-NiAl合金反应制备的复合成形工艺研究。首先，通过Ni/Al界面调控，制备出层间结合紧密且塑性高的Ni/Al叠层圆筒坯；然后，在不同工艺参数下研究了Ni/Al叠层材料的热态气压成形规律及微观损伤控制方法，成形出贴模良好的变截面管件；最后，通过反应制备将Ni/Al叠层材料构件转变为NiAl合金构件。研究表明：温度和气压加载速率是Ni/Al叠层材料热态气压成形的关键参数，在合理的温度下，通过气压加载速率调控应变速率，可避免微观损伤、控制圆角精度；经反应制备获得的NiAl合金变截面薄壁构件，其900 ℃时的抗拉强度达到110 MPa。

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 ℃.

基金项目：

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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