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Fracture in rolling processes

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Journal of Applied Metalworking

Abstract

Cracking of the workpiece in rolling, whether in the form of edge or surface cracking, alligatoring or nose splitting, or damage to the workpiece center, invariably results in increased scrap and production costs. This review of causes and effects concludes that inhomogeneous deformation and attendant large secondary tensile stresses are necessary criteria for the initiation of ductile fracture. Through thickness inhomogeneity results in surface or center fracture, whereas lateral inhomogeneity leads to edge cracking. Alligatoring, the least understood defect, is perhaps promoted by both types of inhomogeneity. A further necessary condition is a material of limited workability or the presence of inhomogeneous workability features. Means of avoiding or minimizing fracture are suggested, and workability in section, tube, and powder rolling is briefly discussed.

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Schey, J.A. Fracture in rolling processes. J. Applied Metalworking 1, 48–59 (1980). https://doi.org/10.1007/BF02833609

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