抄録
The inhomogeneity and the residual stress are known to be important factors in determining the fatigue strength of laminated inhomogeneous metals such as induction hardened materials, carburized hardened materials, superficially worked materials and other surface treated materials. This paper is concerned with the inhomogeneity and the residual stress after some heat treatments of a clad plate composed of mild steel and high strength steel, which can be regarded as an example of the above mentioned materials.
The results obtained are as follows: The microstructure, the hardness and the residual stress are discontinuous at the boundary between two materials of the clad plate. The distributions of the hardness and the residual stress were explained quantitatively in terms of carbon diffusion at the boundary in the clad plate.
