PSI - Issue 33

Wei Song et al. / Procedia Structural Integrity 33 (2021) 795–801 Author name / Structural Integrity Procedia 00 (2019) 000–000

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components, are demonstrated in Fig. 6. Comparing the FEM results and experimental data, some local discrepancies are presented. The maximum values near the HAZ and junction area of weld passes were not captured utilizing the hole-drilling strain-gauge method. In the Fig. 6, the predicted longitudinal residual stress results based on the comprehensive model seem more accurate than other models by the comparisons with the experimental data. On the other hand, the calculation results with and without the SSPT effect are compared by the experimental data. The residual stress values from these four material models cannot be distinguished, consistent with the measured data regarding the transverse direction. On the other hand, the simulation longitudinal and transverse residual stresses from different material models depict similar distributions in Fig. 6(c) and (d), respectively. 4. Conclusions The present paper studies the residual stress distributions and thermo-mechanical-metallurgical behavior of high strength steel (10CrNi3MoV) multipass welded joints considering the SSPT Effect and yield stress mismatched of filler materials. A 2-D thermo-elastic-plastic FE analysis coupled with yield stress variation and SSPT effects was explored and validated by experimental data. The variations of material plasticity constitutive models exhibit an obvious influence on the residual stress prediction from the FE simulations. The comprehensive model considering the SSPT and yield stress variation in high temperature stage obtain a more accurate prediction compared with experimental data. The model taking into account of SSPT and yield stress effects in the welding processing effectively enhances the computational precision of residual stress. The evenmatched filler material can induce great compressive residual stress in the weld zone. While the results in UM welded joints show tension residual stress without the consideration of SSPT. Acknowledgements The research project is supported by the Natural Science Foundation of Jiangsu Province (grant no. BK20200174), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (grant no. 20KJB430008), and the Qinglan project of Jiangsu province. References Amraei, M., Skriko, T., Björk, T., Zhao, X.-L., 2016. Plastic strain characteristics of butt-welded ultra-high strength steel (UHSS). Thin-Walled Structures 109, 227-241. Ghosh, M., Kumar, K., Mishra, R.S., 2010. Analysis of microstructural evolution during friction stir welding of ultrahigh-strength steel. Scripta Materialia 63(8), 851-854. Guo, W., Li, L., Dong, S., Crowther, D., Thompson, A., 2017, Comparison of microstructure and mechanical properties of ultra-narrow gap laser and gas-metal-arc welded S960 high strength steel . Optics and Lasers in Engineering 91, 1-15. Gibmeier, J., Obelode, E., Altenkirch, J., Kromm, A., Kannengießer, T., 2014. Residual stress in steel fusion welds joined using low transformation temperature (LTT) filler material. Materials Science Forum, 620-627. Khurshid, M., Barsoum, Z., 2015. Load carrying capacities of butt - welded joints in high strength steels. Journal of Engineering Materials and Technology, Transactions of the ASME 137(4). Lee, M., Kang, N., Liu, Cho, S., K., 2016. Effects of inclusion size and acicular ferrite on cold cracking for high-strength steel welds of YS 600 MPa grade. Science and Technology of Welding and Joining 21(8), 711-719.