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Effects of Addition of Titanium on Microstructures and Properties of Laser Butt Welded Joints of Mo–30W Alloy

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Abstract

The fusion welding of Mo–30W alloy, a kind of brittle and refractory materials, is still challenging. This study investigated effects of addition of titanium (Ti) on microstructures and properties of laser butt welded joints of Mo–30W alloy. The microstructure, phase distribution and mechanical performance of the welded joint with and without Ti were studied by optical microscope, scanning electron microscope, energy-dispersive spectrometer, electron backscattering diffraction, microhardness tests and tensile tests. The tensile strength of Mo–30W laser welded joint was increased from 108.56 to 409.57 MPa by adding Ti element, reached 58.34% that of base metal. MoO2 phase and WO2 phase precipitated at the grain boundary of FZ region of Mo–30W alloy laser butt welded joints without Ti, which significantly reduced the grain boundary strength, resulting in low tensile strength. After the addition of Ti, TiO2 phase with low Gibbs free energy was formed in GBs (grain boundaries), which reduced the number of MoO2 phase and WO2 phase harmful to the GBs strength, therefore, the tendency of grain boundary embrittlement was reduced. The research results can provide reference for laser welding of brittle and refractory metals.

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Acknowledgments

This work was also supported by National Natural Science Foundation of P. R. China (Grant No. 51775416) and Science and Technology Major Project of Shaanxi Province (2020ZDZX04-01-02). The authors are also grateful to the support of Instrument Analysis Center of Xi'an Jiaotong University.

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Authors and Affiliations

  1. State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, 710049, China

    Pei-Xin Cheng, Lin-Jie Zhang, Jie Ning & Suck-Joo Na

  2. ACIV Xi’an Aircraft Industry Group Company LTD., Xi’an, 710089, China

    Yong-qing Pang

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  1. Pei-Xin Cheng
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Cheng, PX., Zhang, LJ., Ning, J. et al. Effects of Addition of Titanium on Microstructures and Properties of Laser Butt Welded Joints of Mo–30W Alloy. J. of Materi Eng and Perform 31, 8542–8553 (2022). https://doi.org/10.1007/s11665-022-06863-9

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