奥氏体不锈钢管窄间隙焊接残余应力分布及径厚比影响研究  

Investigation on Residual Stress Distribution in An Austenitic Stainless Steel Pipe Narrow-gap Girth Weld and Effect of Radius-to-wall Thicknesss Ratio

作　　者：晏嘉陵 刘川 褚巧玲[4] 刘明星 YAN Jialing;LIU Chuan;CHU Qiaoling;LIU Mingxing(Datang Boiler and Pressure Vessel Inspection Center Co.,Ltd.,Hefei 230088,China;China Datang Corporation Science and Technology Research Institute Co.Ltd.,East China Electric Power Test&Research Institute,Hefei 230088,China;School of Mechatronic Engineering and Automation,Foshan University,Foshan 528225,China;College of Materials Science and Engineering,Xian University of Technology,Xi'an 710048,China)

机构地区：[1]大唐锅炉压力容器检验中心有限公司,安徽合肥230088 [2]中国大唐集团科学技术研究总院有限公司华东电力试验研究院,安徽合肥230088 [3]佛山科学技术学院机电工程及自动化学院,广东佛山528225 [4]西安理工大学材料科学与工程学院,陕西西安710048

出　　处：《热加工工艺》2023年第11期72-78,83,共8页Hot Working Technology

基　　金：国家自然科学基金项目(51575251);陕西省高校科协青年人才托举计划项目(No.20200416);广东省普通高校创新团队项目(2022KCXTD029)。

摘　　要：采用轮廓法试验测试和有限元数值模拟研究φ273 mm×28 mm的316L奥氏体不锈钢管窄间隙多道焊接残余应力的分布特征,并基于数值模拟研究了不同径厚比对管环焊缝残余应力的影响规律。结果表明:计算得到的环向应力和轮廓法测试结果在焊缝内部的分布趋势相近;焊缝区环向应力和轴向应力沿厚度方向呈现“弯曲型”分布特征,即内壁附近的焊缝及邻近区域为压缩应力,外壁区域为拉伸应力。厚度不变的情况下,随着径厚比R/t增大,焊缝区域的环向拉伸应力区略增大,压缩应力区减小;而内壁附近的轴向压应力值减小,外壁附近的轴向拉应力值也减小,沿厚度方向的轴向应力向“自平衡”应力状态转变。The residual stress distribution in narrow gap multipass girth weld of an austenitic stainless steel pipe of φ273 mm×28 mm was investigated with the experiment by contour method and finite element numerical simulation method.The effect of radius-to-wall thickness ratio(R/t)on the residual stress distribution in the girth weld was also investigated using the finite element method.The results show that the distributions of hoop stress in the girth weld obtained by the contour method and finite element method are similar.The hoop and axial stresses in the weld zone demonstrate a bending-type distribution,which means that the stress of the inner surface in the weld and its adjacent region is compressive and that of the outer surface is tensile.Under the same wall thickness,the region of hoop tensile stress increases a litle with the value of R/t increasing,while the region of hoop compressive stress decreases.With the value of R/t increasing,the axial compressive stress value of the inner surface and its adjacent region decreases,and that of the outer surface and its adjacent region decreases too,and the axial stress in thickness direction changes to self-equilibrating stress type.

关 键 词：奥氏体不锈钢管 环焊缝 残余应力 有限元法 径厚比 

分 类 号：TG404[金属学及工艺—焊接]