喷丸消除S30408对接焊接头残余应力研究  

Study on Residual Stress Relief of S30408 Butt Welded Joint by Shot Peening

作　　者：孙贺 胡效东[1] 梁泽华 周凡 SUN He;HU Xiaodong;LIANG Zehua;ZHOU Fan(College of Mechanical and Electronic Engineering,Shandong University of Science and Technology,Qingdao 266590,China;Himile Group Co.,Ltd.,Gaomi 261500,China;College of New Energy,China University of Petroleum(East China),Qingdao 266590,China)

机构地区：[1]山东科技大学机械电子工程学院,山东青岛266590 [2]豪迈集团股份有限公司,山东高密261500 [3]中国石油大学(华东)新能源学院,山东青岛266590

出　　处：《热加工工艺》2023年第3期153-158,共6页Hot Working Technology

摘　　要：采用手工氩弧焊对接焊接两块200mm×100mm×6 mm的S30408不锈钢板材,用试验和模拟相结合的方法研究焊缝附近残余应力分布及喷丸对残余应力场的影响。结果表明:试样在喷丸前,焊缝附近存在较大的残余拉应力,沿焊缝中心线对称分布,横向残余拉应力最大为138MPa,纵向残余拉应力最大为295 MPa。比较试样表面在丸粒速度为100 m/s,丸粒直径为0.5 mm,覆盖率100%喷丸前后的残余应力,表明喷丸可以消除残余拉应力并引入高幅压应力。建立了随机分布喷丸模型并进行数值模拟,模拟结果与试验吻合良好。通过模拟不同丸粒速度和直径下残余应力分布,发现丸粒速度从80 m/s增加到160 m/s,或直径从0.3 mm增加到1 mm,试样表面及次表面引入的残余压应力值也增大。Two pieces of 200 mm×100 mm×6 mm S30408 stainless steel plates were butt welded by manual argon arc welding. The residual stress distribution near the weld and the effect of shot peening on the residual stress field were studied by means of test and simulation. The results show that there is a large residual tensile stress near the weld before shot peening,which is symmetrically distributed along the weld centerline. The maximum transverse residual tensile stress is 138 MPa, and the maximum longitudinal residual tensile stress is 295 MPa. Comparing the residual stress on the sample surface before and after shot peening with shot velocity of 100 m/s, shot diameter of 0.5 mm, coverage rate of 100%, it is found that shot peening can eliminate residual tensile stress and introduce high compressive stress. A random distributed shot peening model was established for numerical simulation, and the simulation results are in good agreement with the experiment. By simulating the residual stress distribution under different shot velocity and diameter, it is found that the residual compressive stress on the surface and subsurface of the specimen increases with the increase of the shot velocity from 80 m/s to 160 m/s or the diameter from 0.3 mm to 1 mm.

关 键 词：焊接 残余应力场 喷丸 数值模拟 

分 类 号：TG178[金属学及工艺—金属表面处理] TG404[金属学及工艺—金属学]