Nowadays, in steel industries, spray quenching has been used as a cooling method for the microstructure optimization after a forging process. In comparison with other cooling systems, there are many process parameters involved in spray quenching, which make it versatile and effective and able to adapt the quenching upon different cross sections of heavy parts. Simulation can represent a useful tool in properly designing the spray process for a specific forging and its reliability depends on the proper definition of input data, in particular of the heat transfer coefficient between the water and the part. Volumetric spray flux has been proposed as one of the preeminent factors on determining the heat transfer coefficient during spray quenching. In industrial processes, the volumetric spray flux is affected by the overlap of sprays on the forging surface due to the uses of multi-nozzles systems. The present paper is aimed at developing a method that takes into account the effect of overlapping of sprays, by the use of a defined amplification factor, on the heat transfer coefficient to be applied in simulation of quenching processes.
Numerical method for modelling spray quenching of cylindrical forgings
Soltani, Mahdi;Pola, Annalisa;La Vecchia, Giovina Marina;Modigell, Michael
2015-01-01
Abstract
Nowadays, in steel industries, spray quenching has been used as a cooling method for the microstructure optimization after a forging process. In comparison with other cooling systems, there are many process parameters involved in spray quenching, which make it versatile and effective and able to adapt the quenching upon different cross sections of heavy parts. Simulation can represent a useful tool in properly designing the spray process for a specific forging and its reliability depends on the proper definition of input data, in particular of the heat transfer coefficient between the water and the part. Volumetric spray flux has been proposed as one of the preeminent factors on determining the heat transfer coefficient during spray quenching. In industrial processes, the volumetric spray flux is affected by the overlap of sprays on the forging surface due to the uses of multi-nozzles systems. The present paper is aimed at developing a method that takes into account the effect of overlapping of sprays, by the use of a defined amplification factor, on the heat transfer coefficient to be applied in simulation of quenching processes.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
