Prediction of plate deformation considering film boiling in water cooling process after line heating

Abstract

The phase of steel changes from austenite to martensite, bainite, ferrite, and pearlite whether it is a rapid cooling or a slow cooling in the actual cooling process after line heating in shipyards. In order to simulate the cooling process, heat transfer analysis was performed considering the effects of impinging water jet, film boiling, and radiation. From above simulation it is possible to find the cooling speed at the inherent strain region and volume percentage of all phases in that region. By the suggested method based on the precise material properties calculated from volume percentage of all phases, it will be possible to predict the plate deformations by line heating more precisely. It is verified by comparing with some experimental results that the present method is very effective and efficient. Copyright © 2005 by The International Society of Offshore and Polar Engineers.