Int. J. Microstructure and Materials Properties, Vol. 12, Nos. 3/4, 2017 239 Copyright © 2017 Inderscience Enterprises Ltd. Thermal characterisation of cooling power of quenchants and its influence on microstructure evolution in EN19 steels using Jominy end quench test setup Vivek Kumar Tiwary* Mechanical Engineering Department, KLS Gogte Institute of Technology, Belagavi, 590008, India Email: vgtiwary@git.edu *Corresponding author Sharaschandra Kusugal Industrial and Production Engineering, KLS Gogte Institute of Technology, Belagavi, 590008, India Email: sharachandrask@git.edu Rahul Rajaram Zajari Production Management KLS Gogte Institute of Technology, Belagavi, 590008, India Email: rzajari@gmail.com Abstract: In this study, hardenability of EN19 alloy steel has been investigated for different quenchants using a Jominy test setup. During experimentation, the temperatures were recorded using a thermocouple inserted in the specimen. Hardenability curves, cooling curves, cooling rate curves and heat flux curves were determined and are presented graphically. Microstructures were developed at various sections of the quenched specimens to study the changes in the morphology of phases. Cooling power of the quenchants has been predicted based on the hardenability curves as well as thermal characterisation. It is observed that brine solution results in more heat extraction from the steel specimens compared with other quenchants. The paper aims to establish that cooling rate curves and heat flux curves determination can be a suitable technique to characterise quenchants to assess its suitability for industrial applications. Keywords: JEQT; Jominy end quench test; hardenability; heat flux; lumped heat; EN19; PAG; polyalkylene glycol. Reference to this paper should be made as follows: Tiwary, V.K., Kusugal, S. and Zajari, R.R. (2017) ‘Thermal characterisation of cooling power of quenchants and its influence on microstructure evolution in EN19 steels using Jominy end quench test setup’, Int. J. Microstructure and Materials Properties, Vol. 12, Nos. 3/4, pp.239–249.