9 research outputs found

    Phase Transformation and Residual Stress in a Laser Beam Spot-Welded TiAl-Based Alloy

    No full text
    The microstructure, chemical composition, residual stress, and lattice parameter evolution ofthe welding zone (WZ) and heat-affected zone (HAZ) of a laser-beam-welded TiAl-based alloywere investigated. It was found that both a2 and c phases remain highly restrained in the WZedge, and the stresses are relieved in the HAZ. A grain refinement mechanism is proposed,which works by heating the material to the b or a+b phase field for a short time. The lamellarcolonies are refined by the Nb-enriched segregations
    corecore