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.
关键词
Mo含量/钛合金/激光焊/金相组织/力学性能
Key words
Mo content,Titanium alloy,Laser welding/Metallographic structure/mechanical property
维普
万方数据