Influence of Material Model on Prediction Accuracy of Welding Residual Stress in an Austenitic Stainless Steel Multi-pas
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JMEPEG DOI: 10.1007/s11665-017-2626-6
Influence of Material Model on Prediction Accuracy of Welding Residual Stress in an Austenitic Stainless Steel Multi-pass Butt-Welded Joint Dean Deng, Chaohua Zhang, Xiaowei Pu, and Wei Liang (Submitted August 25, 2016; in revised form February 9, 2017) Both experimental method and numerical simulation technology were employed to investigate welding residual stress distribution in a SUS304 steel multi-pass butt-welded joint in the current study. The main objective is to clarify the influence of strain hardening model and the yield strength of weld metal on prediction accuracy of welding residual stress. In the experiment, a SUS304 steel butt-welded joint with 17 passes was fabricated, and the welding residual stresses on both the upper and bottom surfaces of the middle cross section were measured. Meanwhile, based on ABAQUS Code, an advanced computational approach considering different plastic models as well as annealing effect was developed to simulate welding residual stress. In the simulations, the perfect plastic model, the isotropic strain hardening model, the kinematic strain hardening model and the mixed isotropic-kinematic strain hardening model were employed to calculate the welding residual stress distributions in the multi-pass butt-welded joint. In all plastic models with the consideration of strain hardening, the annealing effect was also taken into account. In addition, the influence of the yield strength of weld metal on the simulation result of residual stress was also investigated numerically. The conclusions drawn by this work will be helpful in predicting welding residual stresses of austenitic stainless steel welded structures used in nuclear power plants. Keywords
annealing effect, finite element analysis, plastic model, residual stress, strain hardening
1. Introduction Austenitic stainless steels such as SUS304 have been widely used in nuclear power plants (NPPs) due to their excellent corrosion-resistance, high strength at elevated temperature and good weldability. At present, there are over four hundred operational NPPs in International Atomic Energy Agency (IAEA) member states. Recent investigations show that stress corrosion cracking (SCC) has been detected in austenitic stainless steel and nickel-based alloy weldments (Ref 1-3). It is well known that SCC is caused by the synergetic action of corrosion environment, materials properties and stress status including residual stress and applied stress. Tensile residual stress in the fusion zone (FZ) and heat-affected zone (HAZ) due to welding has been identified as one of the major factors resulting in SCC (Ref 4-8). Therefore, in order to assess the safety and integrity of a nuclear power component, it is
Dean Deng, College of Materials Science and Engineering, Chongqing University, No. 174, Shazhengjie, Shapingba, Chongqing 400044, China; and State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China; Chaohua Zhang and Xiaowei Pu, College of Materials Scien
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