DISTRIBUTIONS OF LOADING AND RESIDUAL-STR ESSES IN CRACKED SURFACES OF CORROSION FATIGUED QUENCHED AND TEMPERED STEEL CK-45

Corrosion fatigue in the active state leads to a great number of short cracks and corrosion pits in the surface of metallic materials. This paper deals with the resulting distributions of loading and residual s tresses in the case of bending fatigue. The material investigated was the quenched and tempered CBN-ground steel Ck 45. Results presented cl early indicate that stress distributions around cracks and corrosion p its are very inhomogeneous. Corrosion pits lead to a relaxation of man ufacturing induced residual stresses. In the loaded state as a consequ ence of notch effects, maximum stresses are observed. which explains t he importance of corrosion pits as crack initiation sites.