EFFECT OF ANNEALING ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF ND: YAG LASER WELDED NICKEL BASED ALLOYS
Keywords:Pulsed Nd, YAG laser welding, dissimilar materials, annealing, micro-hardness, tensile strength
This study reports the effect of post weld annealing on the microstructure and mechanical strength of pulsed Nd: YAG laser welded Hastelloy C-276-Monel 400 sheets. The as weld microstructure reveals the dentritic mode of grain solidification, whereas, post annealing reveals a finer and columnar micro dentritic structure. Vickers micro-hardness and tensile strength of the annealed weld joints, as per standard procedure, were determined and correlated with the as-welded one. The annealed samples show marginal reduction in mechanical strength than the as-weld condition.
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