Comparative investigations of interfacial heat transfer behaviour during hot forging and rolling of steel with oxide scale formation

Abstract

In this paper, the results of hot axisymmetric forging and flat rolling experiments using plain carbon steel with oxide formation conducted under nearly identical conditions of initial temperature, specimen thickness and surface quality, and deformation speed and reduction are presented. Temperature measurements and computations indicate that, under the approximately identical deformation conditions, the interfacial heat transfer coefficients (IHTCs) from hot rolling are substantially higher than those from hot forging. The thermal and physical mechanisms governing these differences are analysed in terms of oxide scale deformation mode, metal flow pattern and contact status.