Abstract
Bimetal joints between high-speed steel and medium-carbon steel are often required in the tool industry. Friction welds were made between this dissimilar combination of materials and the joint behaviour was evaluated under conditions appropriate to the intended service applications. The welding was carried out under optimized conditions, the joints were subjected to a heat treatment schedule that is usual in service, and the joint performance was estimated in dynamic torsion. The structural changes occurring during welding and during the subsequent heat treatments were followed by optical metallography and hardness testing. The results show that, although decarburization occurs during post-weld annealing in the medium-carbon steel adjacent to the weld, the joint properties are adequate for moderately severe drilling conditions. Friction welding may thus prove to be an acceptable process for producing such joints.
MST/393
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