Defect healing in the axial zone of continuous-cast billet

Abstract

Minimization of the metal consumption in components imposes ever-increasing structural requirements on steel. Accordingly, it is important to study the behavior of structural defects in continuous-cast billet (shrinkage pores, gas bubbles, axial porosity) during deformation. The use of laminar physical models to study the pressure treatment of metals is further developed in the present work. The influence of the strain on defect healing may be assessed by using laminar models together with defect application to the surface of layer n and the analysis of information regarding its distortion. The proposed method is applied to the deformation of continuous- cast bar billet in the first three rectangular grooves of the reduction cell in the 500/370 linear rolling mill at PAO Donetskii Metalloprokatnyi Zavod. On the basis of the experimental data, the existing healing mechanism for axial metal defects may be refined in terms of the total extension and the applied deforming forces.