Changes of Dislocation Structure and Magnetic Properties in Tensile and Fatigue Deformed Low Alloy Steel

Abstract

In tensile and fatigue deformed low carbon steels, the magnetic parameters and the total dislocation density were measured. The total dislocation density that was measured by transmission electron microscopy (TEM) reflects the information of cellular dislocation structure. Magnetic parameters, coercive field H_C and the coefficient of magnetic susceptibility c had dependency on ρ_t, written as H_C∝ρ_t^1/2 and c∝ρ_t. These magnetic parameters have simple dependences on dislocation density, and would be useful for nondestructive evaluation of internal structure in practical steel.