Effect of Manganese Sulphide Shapes on the Work-hardening Coefficient of Hot Rolled Structural Steel

Abstract

This paper studied the effect of non‐metallic inclusions shapes (manganese sulphides on the tensile testing behavior, the work‐ hardening coefficient and rate. Longitudinal and Transverse tensile testing was carried out. The fracture surface was studied after tensile testing. Chemical analysis for the non‐metallic solution was conducted using EDS‐SEM. Tensile testing was carried out in thickness direction and in parallel to the direction of rolling. The work‐hardening coefficient (with tensile samples of the thickness) increases with the types II and III. It is found that the work‐hardening rate for types of non‐metallic inclusions is similar and has critical change. It is also observed that the non‐metallic inclusions Type II and III can resist the crack propagation due to crack tip or plastic zone at the onset of crack.