Spray quenching has been utilized as a cooling procedure for the microstructure optimization afterwards a process of forging. The metallurgical property of steel forged depends on the rate which the component is quenched. Spray cooling appears to be a flexible and suitable method for quenching parts reducing residual stresses and distortions with respect to the ones obtained using the traditional immersion water quenching. However to optimize the spray quenching results it has been demanded the implementation of an intelligent spray system with special identification of behaviour for air and water supply conditions considered to quench a component as rapidly and uniformly, both together, to achieve particularly appropriate microstructure and mechanical properties. In fact there are various effective parameters in spray heat transfer constitutive equations that have to be taken into account in comparison with other cooling system, such as micro-channel flow and jet impingement. Spray heat transfer formula are dependent on the spray's local volumetric flux, mean droplet diameter, mean droplet velocity and liquid properties. The focus of this research has been on making comparison between some proposed theories and experimental data considering the spray quenching of simple geometry like cylinders describing the connection between local heat flux and local temperature during spray cooling.
Comparison of spray quenching models for cylindrical heavy forgings
SOLTANI, Mahdi;POLA, Annalisa;LA VECCHIA, Giovina Marina
2014-01-01
Abstract
Spray quenching has been utilized as a cooling procedure for the microstructure optimization afterwards a process of forging. The metallurgical property of steel forged depends on the rate which the component is quenched. Spray cooling appears to be a flexible and suitable method for quenching parts reducing residual stresses and distortions with respect to the ones obtained using the traditional immersion water quenching. However to optimize the spray quenching results it has been demanded the implementation of an intelligent spray system with special identification of behaviour for air and water supply conditions considered to quench a component as rapidly and uniformly, both together, to achieve particularly appropriate microstructure and mechanical properties. In fact there are various effective parameters in spray heat transfer constitutive equations that have to be taken into account in comparison with other cooling system, such as micro-channel flow and jet impingement. Spray heat transfer formula are dependent on the spray's local volumetric flux, mean droplet diameter, mean droplet velocity and liquid properties. The focus of this research has been on making comparison between some proposed theories and experimental data considering the spray quenching of simple geometry like cylinders describing the connection between local heat flux and local temperature during spray cooling.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
