TWI Industrial Member Report Summary 131/1980
By S Elliott
The tensile and impact properties of diffusion bonds made under various conditions of temperature, pressure and time in a medium carbon steel (EN8) have been assessed. Tensile strength properties equal to that of the normalised parent material have been achieved over a wide range of temperature/time and pressure combinations. A post bond normalising treatment is required to obtain acceptable levels of impact properties, but with such a treatment, impact strengths equivalent to those of parent material similarly thermally cycled can be achieved.
Detailed metallurgical investigations of bond cross-sections and fracture faces have led to a greater understanding of the mechanisms involved in diffusion bonding.