THE CRACKS ON SLAB CORNER DURING HOT ROLLING PROCESS
连铸板坯热轧中角部裂纹变化的研究

The slab corner surface transversal cracks and longitudinal cracks during a multi-pass V-H rolling process with plain-barreled vertical roll and shape vertical roll were simulated by the explicit dynamic finite element method and updating geometric method, and the effects of vertical roll shape during rolling process on crack closure and growth were analyzed. Results show that, when applying plain-barreled vertical roll during multi-pass V-H rolling process, the deformation of slab corner crack is large, and it tends to spread, for slab corner transversal cracks, the nodes on crack tip lines may diffuse outwards, for triangle transversal cracks and longitudinal cracks, one side of crack may be folded; when applying shape vertical roll during multi-pass V-H rolling process, after vertical rolling, the cracks are closed well, after horizontal rolling, the longitudinal cracks and transversal cracks on slab side surface may open again, but the transversal cracks on slab top surface can be closed well, at the same time, only triangle longitudinal cracks show the phenomenon that one side of crack is folded.