低合金鋼における引張変形と疲労変形による微細組織および磁気特性の変化

抄録

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.