The effect of convective heat transfer coefficient on the residual stresses after cooling from solution heat treatment

摘要

The influence of convective heat transfer coefficient on the residual stresses in a jet engine component is investigated by use of the finite element method.The component is heated to soluting temperature 980 deg C and is held at that temperature a certain time to relieve the residual stresses introduced by the previous forging operation.The aim of the study is to predict the residual stresses in the component introduced by the cooling from solutioning temperature to room temperature and also to estimate the sensivity to changes in the convective heat transfer coefficient and asymmetry in the convective bondary condition.The results show that the residual stresses are not influenced considerably by changes in convective heat transfer coefficient,assuming the convective heat transfer coefficient is held within what is reasonable for an air cooling procedure.Also the asymmetry in the convective boundary condition does not influence the residual stress pattern much.