| 引用本文: | 王斌,张凯锋,蒋少松,王克环.Ti2AlNb合金超塑成形／扩散连接工艺研究[J].哈尔滨工业大学学报,2016,48(5):72.DOI:10.11918/j.issn.0367-6234.2016.05.011 |
| WANG Bin,ZHANG Kaifeng,JIANG Shaosong,WANG Kehuan.Research on superplastic forming/diffusion bonding technology of Ti2AlNb alloy[J].Journal of Harbin Institute of Technology,2016,48(5):72.DOI:10.11918/j.issn.0367-6234.2016.05.011 |
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| 摘要: |
| 为研究Ti2AlNb合金的超塑性及其成形性能，在920~960℃温度区间，应变速率10-3-10-5s-1范围内对该材料的超塑性进行了研究，结果表明该材料在960℃，1×10-4s-1应变速率时具有较好超塑性，最大延伸率可达230%，应变速率敏感性指数为0.31；用Marc软件模拟了Ti2AlNb合金的3层结构超塑成形过程，对缺陷形成进行分析，分析表明在芯板厚度为面板厚度1/3时，可改善3层结构表面缺陷；用超塑成形/扩散连接工艺实现了Ti2AlNb合金3层结构的制备，并通过改变芯板和外层面板的厚度比改善了3层结构表面缺陷，结果表明，采用合理的工艺方式及工艺参数能够实现该合金的空心夹层结构的制备.
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| 关键词: Ti2AlNb合金 超塑性 有限元分析 超塑成形／扩散连接 |
| DOI：10.11918/j.issn.0367-6234.2016.05.011 |
| 分类号:TG146.2+3 |
| 文献标识码:A |
| 基金项目:国防基础科研重大项目(C0420110002). |
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| Research on superplastic forming/diffusion bonding technology of Ti2AlNb alloy |
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WANG Bin, ZHANG Kaifeng, JIANG Shaosong, WANG Kehuan
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(National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China)
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| Abstract: |
| In order to study the Ti2AlNb alloy superplastic forming and its performance, the materials with temperature range in 920~960℃ and rate of strain 10-3~10-5 s-1 within the scope of superplasticity are studied. The results show that the material at 960℃, 1×10-4 s-1 when the strain rate has a good superplasticity with maximum elongation rate reaching 230% and strain rate sensitivity index 0.31. Marc software was used to simulate the three layers structure of Ti2AlNb alloy superplasticy forming process, and the formation of defects was analysed. The analysis results show that the 1/3 of the core sheet thickness of the face sheet thickness, can effectively improve the three layers structure of surface defects; Combined with superplastic forming/diffusion bonding process, it realizes Ti2AlNb alloy the preparation of three layers structure, and improves three layers structure surface defects by changing the core sheet and the thickness of the face sheets. The results show that using reasonable technology and process parameters can achieve the preparation of hollow sandwich structure of the alloy.
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| Key words: Ti2AlNb alloy Superplasticity Finite element analysis SPF／DB |
