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郝传勇, 时元宝, 李正林, 毛先锋. Ti-5Al-4Sn-2Zr-1Mo-0.25Si-1Nd合金焊接性[J]. 焊接学报, 2003, (3): 9-12,16.
引用本文: 郝传勇, 时元宝, 李正林, 毛先锋. Ti-5Al-4Sn-2Zr-1Mo-0.25Si-1Nd合金焊接性[J]. 焊接学报, 2003, (3): 9-12,16.
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HAO Chuan yong, SHI Yuan bao, LI Zheng lin, MAO Xian feng. Weldability of Ti-5Al-4Sn-2Zr-1Mo-0.25Si-1Nd Alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2003, (3): 9-12,16.
Citation: HAO Chuan yong, SHI Yuan bao, LI Zheng lin, MAO Xian feng. Weldability of Ti-5Al-4Sn-2Zr-1Mo-0.25Si-1Nd Alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2003, (3): 9-12,16.
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Ti-5Al-4Sn-2Zr-1Mo-0.25Si-1Nd合金焊接性

Weldability of Ti-5Al-4Sn-2Zr-1Mo-0.25Si-1Nd Alloy

    摘要
  • 摘要: 考察了Ti-5Al-4Sn-2Zr-1Mo-0.25Si-1Nd合金焊接接头力学性能。结果表明,Ti-5Al-4Sn-2Zr-1Mo-0.25Si-1Nd钛合金的焊接热影响区存在硬化倾向,塑性不足。焊前预热150℃可使焊接热影响区塑性明显改善。通过改变焊缝合金系统和焊后热处理制度等工艺措施,可以调整焊缝的综合力学性能,使之达到技术指标要求。文中还探讨了Ti-5Al-4Sn-2Zr-1Mo-0.25Si-1Nd合金焊接脆性的机理,认为延晶界成串分布的富钕相和晶内的马氏体转变组织是根本原因。

     

    Abstract: The weldability of Ti-5Al-4Sn-2Zr-1Mo-0.25Si-1Nd alloy was investigated.The test results showed that the heat affected zone (HAZ) of Ti-5Al-4Sn-2Zr-1Mo-0.25Si-1Nd alloy weldment exhibit obvious ductility decrease and the 150℃ preheat can improve the HAZ ductility to a certain extent.Combined with alloy system adjustment and appropriate postweld heat treatment,the weldment comprehensive properties were controlled to meet the specifications.Nd-rich particle clusters along the grain boundaries and the inner grain martensite structure were considered to be two essential factors embrittling the Ti-5Al-4Sn-2Zr-1Mo-0.25Si-1Nd alloy weldments.

     

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