Abstract
Solid diffusion bonding of China low activation martensitic (CLAM) steels was performed. The bonding process was designed based on the austenite transformation, and the austenite transformation information was obtained by using high-resolution dilatometer prior to diffusion bonding. The reliable joining between CLAM/CLAM steels was obtained by using a two-step diffusion bonding procedure. Ultrasonic non-destructive testing revealed no lack-of-bonding porosities at the diffusion bonding interface. Details on interfacial microstructure and mechanical properties of diffusion bonded joint were investigated. Microstructure analysis showed the uniform distribution of elements across the joint, and there was no significant microstructure gradient at the vicinity of the joint. The tensile properties of diffusion bonded samples are almost identical to those of base metal. However, the fracture position of the diffusion bonded samples was located on the base materials, which is related to the finer martensite near the joint zone.
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