Abstract
The optimisation of TLP-bonding process for Ni-base superalloy, IN738LC has been carried out using the Bayesian Expert System for TLP-bonding. The evaluation factors introduced as an index of bonding performance of an insert metal involved the melting point of insert metal, hardness and formability of brittle phases in the bond layer. The chemical composition of Ni-3.0Cr-8.1Si-1.0B (mass%) was determined as the optimal composition of an insert metal. The processing parameters have been optimised with two evaluation factors; the joint strength and toughness. The optimal bonding condition was determined as 1433K×5.6ks. Brittle phases were not formed in the bond layer using a newly developed insert metal, and the joint strength and toughness was superior to the average of the base metal properties.
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