Abstract
The effect of heat treatment on the weldability of sintered molybdenum was examined by tensile properties at room temperature. Fracture surfaces were characterized by scanning electron microscopy and scanning Auger electron spectroscopy. In as-welded specimens, tensile strength exhibited a considerable increase by stress relief annealing and a rapid decrease by the annealing before welding. An increase of the annealing temperature before welding served to reduce ductility. Post-weld heat treatment reduced the strength in the specimens which were annealed up to 1173 K before welding. But much improvement in strength was gained by increasing post-weld annealing temperature in the annealed welds before welding. Ductility was also improved considerably with an increase of post-weld annealing temperature. Fracture initiated predominantly at grain boundaries and propagated in a mixed manner in weld metal. Nitrogen and oxygen segregation seemed to promote decohesion of grain boundaries. Carbon segregation and precipitation by heat treatment, especially during post-weld annealing, strengthened the cohesion of grain boundaries and resulted in improving the ductility.
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