Effect of the defect initial shape on the fatigue lifetime of a continuous casting machine roll

摘要

The article deals with the influence of the defect initial shape on the residual lifetime of a continuous casting machine roll made of 25Cr1MoV steel. Based on this approach, previously proposed by some authors, the growth of the surface fatigue crack was modeled in a roll under loading and temperature conditions that are close to operational ones, taking into account the statistical distribution of the C parameter of Paris' equation. Dependencies of the continuous casting machines roll fatigue lifetime on the initial defect shape and critical defect sizes are obtained. (C) 2016 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.