Abstract：In the design of a reactor pressure vessel, various circular structures have been set in reactor pressure vessel (RPV) to realize the compact arrangement of small modular reactor. It is the first time that this kind of circular structures appeared in RPV design. Because of the large thickness and high restraint intensity weld structure brought by these circular structures, the residual stress of welds between circular structure and RPV inner wall have shown features including high amplitude and complicated distribution. Besides, the circular structures need to sustain high temperature, high pressure, strong radiation and high dynamic load for a long life time, which raises very strict performance requirements of the circular structures. Hence, the welding residual stress generated from the large thickness welds between circular structure and RPV inner wall shall be carefully researched and analyzed. In this paper, the distribution feature and influence factors of the welding residual stress have been deeply studied by combination of experiment and numerical simulation method. The results indicate that: firstly, residual stress of low alloy steel weld can be effectively reduced by the stress relieving heat treatment; secondly, amplitude and distribution of the welding residual stress would not be influenced by post-heat treatment, grind and intermediate heat treatment.
[1]张华军，陆汉忠，沈大明，等.大厚板高强钢补焊横向裂纹试验及产生机理[J].焊接学报, 2011, 32(4):75-78
[2]ASTM E837-2013.Standard Test Method for Determining Residual Stresses by the Hole-Drilling Strain-Gage Method.
[3]Prime MB.Cross-sectional mapping of residual stresses by measuring the surface contour after a cut[J].Journal of Engineering Materials and Technology, 2001, 123(2):162-168
[4]刘川，庄栋.基于轮廓法测试内部焊接应力[J].机械工程学报, 2012, 48(8):54-59
[5]Masahito Mochizuki, Kunio Enomoto, Noriaki Okamoto, et al.Welding residual stresses at the intersection of a small diameter pipe penetrating a thick plate[J].Nuclear Engineering and Design, 1993, 144(3):439-447
[6]Deng Dean, Ogawa Kazuo, Kiyoshima Shoichi, et al.Prediction of residual stresses in a dissimilar metal welded pipe with considering cladding,buttering and post weld heat treatment[J].Computational Materials Science, 2009, 47(2):398-408
[7]Ure J, Chen Haofeng, Tipping D.Calculation of a lower bound ratchet limit part 2 Application to a pipe intersection with dissimilar material join[J]. European Journal of Mechanics A/Solids, 2013, 37: 369-378.
[8]Muránsky O, Smith MC, Bendeich PJ, et al.Validated numerical analysis of residual stresses in Safety Relief Valve (SRV) nozzle mock-ups[J]. Computational Materials Science 2011, 50 (7): 2203–2215.
[9]付强，罗英，杨敏，等.反应堆压力容器顶盖和管座贯穿件型密封焊残余应力三维有限元数值模拟[J].焊接学报, 2015, 36(11):105-108
2022, Vol. 29 