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首页> 外文期刊>Journal of Materials Science >Effect of laser beam welding on fracture toughness of a Ti-6.5Al-2Zr-1Mo-1V alloy sheet
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Effect of laser beam welding on fracture toughness of a Ti-6.5Al-2Zr-1Mo-1V alloy sheet

机译：激光焊接对Ti-6.5Al-2Zr-1Mo-1V合金薄板断裂韧性的影响

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摘要

Investigation of fracture toughness on Ti-6.5Al-2Zr-1Mo-1V alloy thin sheet and its laser-welded joints has been carried out. In the test compact tension (CT) specimens and single specimen technology were used. In addition, hardness distribution and microstructure of the welded joints were examined. Fracture test indicates that brittle unstable fracture occurs after slow crack propagation for all the specimens, except that one heat affected zone (HAZ) specimen is brittle crack initiation. It is found that rolling directions have no obvious effect on fracture toughness of base metal. Moreover, fracture toughness of weld metal is obviously decreased in comparison with base metal whatever in as-welded condition or in stress relief condition. Post-weld heat treatment (PWHT) leads to fracture toughness of the welds further decreasing. Fractography observation shows that the fracture mode is predominantly dimpled in base metal. However, there exists intergranular fracture in the weld metal. Thus, the transition of fracture mode from both base metal and HAZ to weld metal may lead to dramatic decrease in fracture toughness. Microstructure examination reveals that the microstructure of weld metal consists of large grains with fine acicular structure. The formation of fine α acicular structure is due to rapid cooling during laser welding. After PWHT, the acicular structure is coarsened.
机译：对Ti-6.5Al-2Zr-1Mo-1V合金薄板及其激光焊接接头的断裂韧性进行了研究。在测试中，使用了紧凑张力（CT）样品和单样品技术。另外，检查了焊接接头的硬度分布和显微组织。断裂试验表明，除了一个热影响区（HAZ）试样是脆性裂纹萌生的，所有试样在缓慢的裂纹扩展后都会发生脆性不稳定断裂。发现轧制方向对母材的断裂韧性没有明显影响。而且，无论在焊接状态还是在应力消除状态下，与母材相比，焊接金属的断裂韧性均明显降低。焊后热处理（PWHT）导致焊缝的断裂韧性进一步降低。断口扫描观察表明，断裂模式主要发生在贱金属中。但是，在焊接金属中存在晶间断裂。因此，断裂模式从母材和热影响区到焊接金属的转变可能导致断裂韧性的急剧下降。显微组织检查表明，焊接金属的显微组织由具有细针状结构的大晶粒组成。细α针状结构的形成是由于激光焊接过程中的快速冷却。 PWHT后，针状结构变粗。

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  • 来源
    《Journal of Materials Science》 |2007年第16期|6651-6657|共7页
  • 作者

    Yaowu Shi; Fei Zhong; Xiaoyan Li; Shuili Gong; Li Chen;

  • 作者单位

    School of Materials Science and Engineering Beijing University of Technology 100 Ping Le Yuan Chaoyang District Beijing 100022 P.R. China;

    School of Materials Science and Engineering Beijing University of Technology 100 Ping Le Yuan Chaoyang District Beijing 100022 P.R. China;

    School of Materials Science and Engineering Beijing University of Technology 100 Ping Le Yuan Chaoyang District Beijing 100022 P.R. China;

    State Defence Key Laboratory For High Energy Density Beam Processing Technology Beijing Aeronautical Manufacturing Technology Research Institute Beijing 100024 P.R. China;

    State Defence Key Laboratory For High Energy Density Beam Processing Technology Beijing Aeronautical Manufacturing Technology Research Institute Beijing 100024 P.R. China;

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