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The range of product sizes which can be produced from a particular continuously cast section is often limited because a minimum overall reduction is demanded in order to consolidate any central unsoundness and to achieve the desired metallurgical properties. The objective of this study has been to investigate the effects of various deformation parameters on both the consolidation of the central region and the recovery of mechanical properties. Rolling trials have been carried out using lead with axial holes drilled to simulate central porosity. Further rolling trials with continuously cast billet examined the evolution of both central porosity and mechanical properties for area reductions up to 20:1. The indentation analogy has provided a simple, qualitative model for predicting the distribution of cumulative shear strain and hence plastic work throughout the stock thickness during rolling. The model shows that the plastic work becomes increasingly non-uniform as h(m)/L increases above 1.0, being greater near the surface of the rolled stock. The progressive deformation of a centreline cavity during rolling has been modelled using a three dimensional finite element technique. The model is accurate in predicting the critical reduction at which closure of the central hole will eventually occur for a given roll gap geometry.

Additional information

Authors: MORRIS P W, British Steel plc, Rotherham (GB);ALBISTON J N, British Steel plc, Rotherham (GB);INGHAM P M, British Steel plc, Rotherham (GB)
Bibliographic Reference: EUR 12957 EN (1990) 200 pp., FS, ECU 16.25
Availability: (2)
ISBN: ISBN 92-826-1680-0
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