Finite element simulation of the residual stress in butt-welded ferritic steel pipe considering the diffusional phase transformation effects
This work aims at developing a thermal-metallurgical-mechanical computational procedure based on ABAQUS code to predict welding residual stresses in multi-pass butt-welded 2.25Cr-1.6W steel pipes, considering the influence of the diffusional phase transformation. In the numerical simulations, the Johnson-Mehl-Avrami-Kolmogorov (J-M-A-K) equations are used to track the austenite-bainite transformation. Based on this model, a new numerical optimization method is developed to determine the parameters in the J-M-A-K equations. This methodology provides a more accurate global optimization to calculate the temperature dependence of austenite-bainite transformation volume fraction under various cooling rates, and sequentially to obtain the corresponding welding residual stresses in multi-pass butt-welded 2.25Cr-1.6W steel pipes. The simulation results reveal that the final welding residual stresses in 2.25Cr-1.6W steel pipes are significantly affected by both volumetric change and bainite transformation volume fraction. A comparison between experimental measurements and theoretical calculations is performed, and the results from those two methods agree well with each other. The effectiveness of the developed computational producer was confirmed.
Diffusional phase transformation Finite element method Welding residual stress
Mengjia Xu Hao Lu Chun Yu Jijin Xu Junmei Chen
Materials Science and Engineering School, Shanghai Jiaotong University, Shanghai 200030, China
国际会议
济南
英文
1-12
2012-08-24（万方平台首次上网日期，不代表论文的发表时间）