Yh. Li et Cm. Sellars, EVALUATION OF INTERFACIAL HEAT-TRANSFER AND ITS EFFECTS ON HOT FORMING PROCESSES, Ironmaking & steelmaking, 23(1), 1996, pp. 58-61
The heat transfer at the tool/workpiece interface governs the temperat
ure development of the workpiece and tools during non-isothermal formi
ng of metals and alloys and, consequently, has a critical influence on
microstructural evolution and power requirements. In the present stud
y, numerical models of heat transfer and experimental measurements by
inserted thermocouples have been used to evaluate the temperature chan
ges of the specimens during hot rolling and forging of steels. Emphasi
s has been given to the effects of the oxide scales formed on the heat
ed carbon and stainless steel specimens and of the percentage reductio
n on interfacial heat transfer. On the basis of computer analysis and
experimental observations, the variation of interfacial heat transfer
coefficient with scale thickness, pressure, and percentage reduction i
s established. (C) 1996 The Institute of Materials.