Study on the Effect of Mo on the Microstructure and Properties of Titanium Alloy Laser Welding Joint
In this paper,the effect of Mo on the microstructure and properties of laser welded joints of titanium alloy superal-loy was studied by preparing welding materials with different Mo content.The properties of welded joints were analyzed by metallographic structure,Vickers hardness,tensile properties and impact toughness.Experimental results show that the cen-ter of the weld is coarse original β-phase columnar crystal,which first increases and then decreases with the increase of Mo content.Several parallel and staggered α'acicular martensite exist in the original β grain,which run through the whole origi-nal β grain and disappear at the grain boundary.The average hardness of weld decreases first and then increases with the in-crease of Mo content in weld,and the impact toughness decreases Due to the presence of porosity in the welded joint of 4%Mo,the tensile fracture position at 650℃was located in the weld,and the fracture positions of other Mo content joints were located in the base metal.
Mo content,Titanium alloy,Laser weldingMetallographic structuremechanical property
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维普
