| 一种钛基钎料钎焊TiAl合金接头的高温力学性能分析 |
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| 引用本文： | 李志锋,李小强,李力,娄立,屈盛官.一种钛基钎料钎焊TiAl合金接头的高温力学性能分析[J].焊接学报,2019,40(5):148-153. |
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| 作者姓名： | 李志锋 李小强 李力 娄立 屈盛官 |
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| 作者单位： | 华南理工大学 国家金属材料近净成形工程技术研究中心,广州,510640;华东交通大学,南昌,330013 |
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| 基金项目： | GF基础科研计划资助项目（JCKY2016603C003）；民口配套规划研制项目（JPPT125GH038）；江西省教育厅科学技术研究资助项目（GJJ170372）；华南理工大学国家金属材料近净成形工程技术研究中心开放基金项目（2016005） |
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| 摘 要： | 采用自主研发的一种Ti-Zr-Cu-Ni-Co-Mo非晶钎料对TiAl合金进行钎焊连接，钎焊温度为1 000 ℃，时间为5 min，对所得的钎焊接头进行了高温抗剪强度和抗拉强度研究，并与母材强度进行了对比. 结果表明，钎焊接头在700 ℃高温下可长期服役，但剪切试验温度高于700 ℃后由于氧化物的生成和钎焊中心区显微组织发生变化导致剪切性能急剧下降，钎焊接头跟母材在不同拉伸试验温度下的抗拉强度随试验温度上升呈下降趋势，两者差距先减小后增大，分别在不高于600和800 ℃条件下仍能保持室温性能的80%以上.
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| 关 键 词： | 钛铝合金 钎焊 高温力学性能 焊后热处理 |
| 收稿时间： | 2017/12/6 0:00:00 |
Analysis on high temperature properties of TiAl alloy joints brazd with a Ti-based filler |
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| LI Zhifeng,LI Xiaoqiang,LI Li,LOU Li and QU Shengguan.Analysis on high temperature properties of TiAl alloy joints brazd with a Ti-based filler[J].Transactions of The China Welding Institution,2019,40(5):148-153. |
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| Authors: | LI Zhifeng LI Xiaoqiang LI Li LOU Li and QU Shengguan |
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| Affiliation: | 1.National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, China2.East China Jiaotong University, Nanchang 330013, China |
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| Abstract: | Vacuum brazing of TiAl alloy with Ti-Zr-Cu-Ni-Co-Mo amorphous filler as interlayer was investigated. The shear strength and tensile strength at high temperature of the joints brazed at 1 000 ℃ for 5 min were studied and was compared with the strength of base metal. Results show that the brazed joints can be used for a long time at 700 ℃, but the shear strength of the joints decreases sharply when the shear testing temperature is higher than 700 ℃ due to the formation of oxide and the change of microstructures in the central zone of brazed joints. The tensile strength of brazed joints and base metal obtained at different tensile testing temperatures decreases with the increasing of testing temperature. The research shows that the gap between brazed joints and base metal decreases first and then increases, and the room temperature performance of brazed joints and base metal can still be maintained above 80% at temperature of not higher than 600 and 800 ℃, respectively. |
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| Keywords: | TiAl alloy brazing high temperature mechanical properties postweld heat treatment |
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