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Microstructure and mechanical property improvement of dissimilar metal joints for TC4 Ti alloy to 301L stainless steel

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Abstract

Pulsed laser welding of Ti alloy to stainless steel (SS) has been applied using pure V as an interlayer. Microstructures and mechanical properties of joints were improved by changing laser offset. Two-pass welding was applied, and two weld zones were produced in the joint. The unmelted V interlayer acted as a barrier to mixing of the two base materials during welding. The melting amount of base materials and V interlayer was controlled by changing laser offset to control the fusion ratio and thus to improve joint microstructure. σ-Phase was present in V–SS weld zone of joint with laser offset of zero, which resulted in failure of the joint. Through changing laser offset, V concentration in V–SS weld zone of SS-0.2 mm offset joint was decreased and σ-phase was eliminated in the joint. ω-Phase was discovered in Ti alloy–V weld zone of zero-offset joint, which had an adverse effect on mechanical property of the joint. Through changing laser offset, V concentration in Ti alloy–V weld zone of V-0.2 mm offset joint was increased and precipitation of ω-phase was prevented. Three joints (zero-offset joint, SS-0.2 mm offset joint and V-0.2 mm offset joint) exhibited the tensile strength of 504, 548 and 599 MPa, respectively.

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Authors and Affiliations

  1. Key Laboratory of Automobile Materials, School of Materials Science and Engineering, Jilin University, Changchun, 130022, China

    Yan Zhang, DaQian Sun, XiaoYan Gu & HongMei Li

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  1. Yan Zhang
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  2. DaQian Sun
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Correspondence to XiaoYan Gu.

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Zhang, Y., Sun, D., Gu, X. et al. Microstructure and mechanical property improvement of dissimilar metal joints for TC4 Ti alloy to 301L stainless steel. J Mater Sci 53, 2942–2955 (2018). https://doi.org/10.1007/s10853-017-1708-z

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  • DOI: https://doi.org/10.1007/s10853-017-1708-z

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