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Effect of laser beam welding on fracture toughness of a Ti-6.5Al-2Zr-1Mo-1V alloy sheet

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Abstract

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.

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Acknowledgement

The authors would like to express their thanks to the financial support from the State Defence Key Laboratory For High Energy Density Beam Processing Technology.

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Authors and Affiliations

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

    Yaowu Shi, Fei Zhong & Xiaoyan Li

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

    Shuili Gong & Li Chen

Authors
  1. Yaowu Shi
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  2. Fei Zhong
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  3. Xiaoyan Li
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  4. Shuili Gong
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  5. Li Chen
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Correspondence to Yaowu Shi.

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Shi, Y., Zhong, F., Li, X. et al. Effect of laser beam welding on fracture toughness of a Ti-6.5Al-2Zr-1Mo-1V alloy sheet. J Mater Sci 42, 6651–6657 (2007). https://doi.org/10.1007/s10853-007-1524-y

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  • DOI: https://doi.org/10.1007/s10853-007-1524-y

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