EFFECT OF CHANGE IN CONCENTRATION OF ETHYLENE GLYCOL AQUEOUS SOLUTION ON HEAT TRANSFER COEFFICIENT DURING QUENCHING PROCESS

Abstract

Simulation of quenching process of steel is one of the method to plot temperature profile and to calculate HTC at surface of specimen Quenching of medium carbon steel in aqueous solution of ethylene glycol with different concentration of 0 % to 60% by mass was done using ANSYS 15.5 CFX workbench. Initial temperature of cylindrical specimen was assumed to be 1173K and for quenchant it was assumed to be 298K. Temperature plots for different concentrations and cooling curves at core and surface of the specimen was obtained. Result of cooling curves at different concentration shows that cooling rate for 0% concentration of ethylene glycol was greatest and it goes on decreasing as concentration of ethylene glycol solution increases. Temperature plots after 10 sec. were presented. Results of temperature plots shows that temperature difference between core and surface temperature of specimen is largest in case of 0% concentration of ethylene glycol solution by mass and it goes on decreases as concentration of ethylene glycol solution by mass increases. In this simulation variation in thermal properties of aqueous solution of ethylene glycol were considered and hence simulation was more accurate. Temperature plots obtained in this simulation will be useful in structural analysis of quenching process to find out residual stresses induced due to temperature gradient.