Further aspects of inclusion deformation

Abstract

Experimental work on a commercial steel and on model systems has been undertaken to increase understanding of the factors influencing non-metallic inclusion deformation in steel. The well established fact of decreasing relative plasticity with increasing deformation is considered in terms of possible mechanisms, using models where appropriate. An approximate relationship between relative plasticity and intrinsic hardness of inclusions and matrix has been established where v=2−H_i/H_m. Theformation of voids and cracks when rolling with rigid inclusions under conditions where such discontinuities do not weld together again has been clearly demonstrated, their detection requiring a high degree of metallographic preparation. The presence of these discontinuities is shown to affect the bulk density of the steel.