Ti2AlNb合金超塑性能及四层立筋结构超塑成形/扩散连接工艺  

Superplastic forming/diffusion bonding of Ti-22Al-27Nb alloy hollow four-layer structure

作　　者：李保永 蒋少松[1] LI Bao-yong;JIANG Shao-song(Harbin Institute of Technology,National Key Laboratory for Precision Hot Processing of Metals,Harbin 150001,China;Beijing Hangxing Machine Manufacturing,Beijing 100013,China)

机构地区：[1]哈尔滨工业大学金属精密热加工国家级重点实验室,哈尔滨150001 [2]北京航星机器制造有限公司,北京100013

出　　处：《中国有色金属学报》2020年第1期103-111,共9页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51775135,51675125)。

摘　　要：对Ti-22Al-27Nb合金四层结构件SPF/DB组合工艺进行试验研究,对Ti-22Al-27Nb合金的超塑性能及扩散连接性能进行探究。拉伸实验表明,当变形温度为960℃、应变速率为1×10^?4 s^?1时,材料伸长率达到最大,为230%。对温度、保温时间和扩散压力对Ti-22Al-27Nb合金接头质量的影响进行研究,结果表明Ti-22Al-27Nb合金扩散连接的最佳工艺参数为(960℃,10 MPa,2 h)。根据高温拉伸试验结果,利用有限元模拟软件对中空四层结构件超塑成形过程进行模拟。通过SPF/DB组合工艺成形得到外观质量良好的Ti-22Al-27Nb合金中空四层结构件,成形构件壁厚分布均匀。The hollow four-layer structure of Ti-22Al-27Nb alloy was fabricated by SPF/DB process.The characteristics and mechanism of Ti-22Al-27Nb alloy with respect to superplasticity and diffusion bonding were investigated.Tensile tests show that the optimal elongation of tensile specimens is 230% at the temperature of 960℃ and the strain rate of 1×10^?4 s^?1.Effect of the bonding pressure,bonding temperature and bonding time to determine the microstructure and mechanical properties of diffusion bonding joints was investigated,and the optimum bonding parameters are(960℃,10 MPa,2 h).Through the finite element simulation,it could be found that the SPF/DB process of hollow four-layer structure is feasible.The hollow four-layer structure of Ti-22Al-27Nb alloy is manufactured,showing that the thickness distribution of the bonding area is uniform.

关 键 词：Ti-22Al-27Nb 扩散连接 超塑成形 四层结构 

分 类 号：TG301[金属学及工艺—金属压力加工]