Abstract
Two mm-thick Ti-6Al-4V alloy plates were friction stir butt welded under natural- and rapid-cooling conditions. The microstructures and mechanical properties of joints were investigated and compared. The rapid cooling via spraying cooling liquid nitrogen on the plate top surface was beneficial to obtaining a narrower cross section and finer and more uniform grains in the stir zone than those obtained by natural cooling. Joint tensile strength of 1021 MPa and elongation of 1.88% under the rapid-cooling condition respectively reached 102.7 and 150.4% of those under the natural-cooling condition, respectively. The uniform-and-compact equiaxed grains led to equiaxed dimples on the fracture surface, which demonstrated a ductile fracture of the welding joints.
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Acknowledgments
This work is supported by the Program for Liaoning Excellent Talent in University (No. LJQ2015084), the China Postdoctoral Science Foundation (No. 2016M590821) and the Guangdong Provincial Key Laboratory of Advanced Welding Technology for Ships (No. 2017B030302010).
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Liu, Z., Wang, Y., Yang, K. et al. Microstructure and Mechanical Properties of Rapidly Cooled Friction Stir Welded Ti-6Al-4V Alloys. J. of Materi Eng and Perform 27, 4244–4252 (2018). https://doi.org/10.1007/s11665-018-3491-7
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DOI: https://doi.org/10.1007/s11665-018-3491-7