Abstract
To make clear the effect of inclusion-shape and distribution on the lamellar taering macro-pattern of fracture surface and direction of crack-propagation have been investigated. As the results, several modified cranfield type cracking test methods have been pi oposed. These cranfield tests have several built-up direction of weld beads against the rolling direction of steels. For comparison, some slow bend tests with same materials are used for the study.Following results were obtained.(1) In the cranfield test, the steels with many elonged inclusions have characteristic striped pattern in their fracture surfaces. Typical terrace-and-wall is obsreved in the cross section along the stripes.(2) Crack-behavior in the cranfield tests shows several different types, it depends on the built-up direction and inclusion-length or width.(3) Slow bend tests have same tendency of crack-behavior in cranfield tests.
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