Impact strength of En8 steel diffusion bonds

The use of diffusion bonding for the joining of steel is not widespread due partly to the large number of alternative welding processes and partly to a lack of information on mechanical properties of the resultant bonds. In this paper, data are provided on both tensile and impact properties of diffusion bonds in a plain carbon steel containing 0.4% C. Several hypotheses are proposed for the observed low impact properties and one of these, the presence of a planar layer of ferrite at the bond line, is discounted.