Diffusion Welding of Molybdenum to Hastelloy Alloy X

概要

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Diffusion welding between pure molybdenum and heat-resisting alloy Hastelloy X has been performed in vacuum at the temperature range of 750℃-1200℃. Two steps welding technique including a short time annealing at high temperature (1 minute at 1200℃) increases the real metal-contact between molybdenum and Hastelloy alloy X, and takes the improvements in joint strength. Furthermore, this technique is useful not to enlarge the deformation at weld joint. Application of Ni insert-metal suppresses the formation of brittle intermetallic compound, P phase, and increases the joint strength. However, the formation of binary compound, δ-MoNi, was observed at bonding interface. Fracture of the weld joints by the tensile strength tests at room temperature has occured always through the intermetallic compounds and also along the grain boundaries of molybdenum base metal. After the welding procedure, the voids and MoO_2 were found out at the grain boundaries of molybdenum using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques.
大阪大学の論文