Microstructure and Mechanical Characterization of Friction-Stir-Welded Dual-Phase Brass
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Friction stir welding (FSW) is an ideal process to join brass to avoid the evaporation of zinc. In the present investigation, 6-mm-thick dual-phase brass plates were joined efficiently using FSW at various tool rotational speeds. The microstructures were studied using optical microscopy, electron backscattered diffraction and transmission electron microscopy. The optical micrographs revealed the evolution of various zones across the joint line. The microstructure of the heat-affected zone was similar to that of base metal. The weld zone exhibited finer grains due to dynamic recrystallization. The recrystallization was inhomogeneous and the inhomogeneity reduced with increased tool rotational speed. The dual phase was preserved in the weld zone due to the retention of zinc. The severe plastic deformation created a lot of dislocations in the weld zone. The weld zone was strengthened after welding. The role of tool rotational speed on the joint strength is further reported.
Keywordsbrass friction stir welding microstructure tensile strength
The authors are grateful to Welding Research Cell at Coimbatore Institute of Technology, Microscopy Lab at University of Johannesburg, OIM and Texture Lab at Indian Institute of Technology Bombay, National Institute of Technology Calicut and PSG College of Technology Coimbatore, for providing the facilities to carry out this investigation.
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