> C. Ruyer-Quil
Study and simulations of water quench process
Sylvain Devynck (Institut jean Lamour)
Cooling from impinging jet is nearly compulsory in steel industry processing especially in Run Out Table processing and steel tubes production because of the high heat transfer rates provided by the boiling of the subcooled water jet. As far as metallurgical phase transformations, residual stresses and deformations in the workpiece are concerned, the temperature drop during cooling must be perfectly controlled thanks to a fully understanding of the heat transfer mechanisms. In order to understand the effect of several industrial quench process parameters we have built an innovative experimental quenching device. It allowed us to make heat transfer measurements at the surface of a hot nickel cylinder cooled by a subcooled water jet, according to several surface velocities, a wide range of impact angles and three jet orientations against gravity. The results clearly highlight an important effect of these parameters on surface heat transfer profiles and will allow us to improve existing heat transfer correlations. We will eventually be able to develop a modeling tool allowing us to follow the tube internal evolutions all along its cooling and therefore to detect process configurations leading to the appearance of quench defects like quench crack or tube bending.