Simulation of oxide scale failure during multipass hot rolling and related product defects

Michał Krzyżanowski¹, J.H. Beynon²

¹The University of Sheffield. ²University of Technology, Melbourne, Australia.

DOI:

https://doi.org/10.7494/cmms.2005.3.0074

Abstract:

The advanced physically based finite element model of the roll-stock interface developed at earlier stages of the research for a single rolling pass has been extended to provide the basis for detailed numerical investigations of the roll/stock interface behaviour during multi-pass hot rolling operations. The research encompassed the following consecutive stages: modelling of the combined hot compression-tension test followed by multi-pass hot rolling modelling of the steel strip having the same thickness. Longitudinal tension was added as a technological parameter. The possibility of a co-operative relationship between the formation of oxide scale related defects at the upper and lower faces and formation of shear zones within the steel strip has been demonstrated numerically. The observed effect is more pronounced for thin or ultra-thin hot rolled strips, such as 0.8 – 1.0 mm in thickness. It has been shown that the through-thickness shear zones within the material can link the scale related defects on both the upper and lower strip surfaces. Formation of the scale related shear zones within the strip volume takes place mainly during the second rolling pass. These zones remain within the strip volume after spallation of the scale fragments. A single scale fragment remaining on the strip surface after the first rolling pass can influence formation of the shear zones during consecutive rolling passes.

Cite as:

Krzyżanowski, M., Beynon, J. (2005). Simulation of oxide scale failure during multipass hot rolling and related product defects. Computer Methods in Materials Science, 5(3), 74 – 82. https://doi.org/10.7494/cmms.2005.3.0074

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