Fracture Toughness of Explosive Stainless-Clad HT80 High Strength Steel

概要

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Fracture toughness of an explosive clad steel composed of SUS304 stainless steel and HT80 high strength steel is investigated. To clarify the effect of metallurgical properties and composite structures on the fracture toughness, both V-notch Charpy test and bending COD test are carried out by using homogeneous and heterogeneous specimens which have been cut from various portions in thickness direction of the clad plate and have notch root or pre-crack leading edge parallel to the plate surface. The absorbed energy of the notched specimens and its component energy for crack initiation from notch root in V-notch Charpy test are affected by both the material involving notch root and the thickness ratio of two different steels in net section of specimen. In static bending test of the heterogeneous specimens with pre-crack tip in stainless steel, fracture occurs in the high strength steel adjacent to weld interface before the pre-crack extends although ductile fracture occurs at pre-crack tip over all temperature range. In the heterogeneous specimens with pre-crack tip in high strength steel, both the critical COD and the stretched zone width depend largely on the material involving pre-crack tip, namely, high strength steel.
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1982-04-01