Contribution to the study of the mechanism of the fish eye formation in steels

This article presents the results of a study on the formation of " fish-eye s " detects provoked by a high concentration of hydrogen in the metal and t riggered on non-metallic inclusions, in low alloy steels of the type A508.3 and 18MND5. The role of various parameters on the formation of fish eyes w as studied, notably the tensile test temperature, the deformation speed, th e three-axiality of stresses, the orientation of test bars and the type of half-product. The results obtained make it possible to specify the mechanis m and the characteristics of fish-eye formation.