Accurate prediction of welding stress evolution by considering improved phase transformation model

Abstract

In this work, a modified Koistinen-Marburger (K-M) relationship was proposed to describe austenite-martensite transformation. The results show that the modified K-M equation was more accurate in predicting the martensite volume fraction. A cyclic uniaxial test consisted of heating and cooling was conducted to verify the accuracy of the modified model. In order to study the welding stress evolution considering the effect of martensite transformation and annealing, both the experiment and simulation on plate fusion welding were carried out. The simulation results indicated that the transformation kinetic and the recrystalization annealing both had non-ignorable effects on the stress evolution. In addition, the simulated residual stress based on the developed model compared well with the data measured by the hole drilling method.