304/Q345R复合板焊接接头微观组织与性能研究  

Research on Microstructure and Properties of Welded Joints of 304/Q345R Composite Plate

作　　者：贾登峰 夏腾辉 杜春平[1] 刘晓刚[2] 刘登峰 JIA Dengfeng;XIA Tenghui;DU Chunping;LIU Xiaogang;LIU Dengfeng(Engineering Integrated Training Centre,Guilin University of Aerospace Technology,Guilin 541004,China;School of Automotive Engineering,Guilin University of Aerospace Technology,Guilin 541004,China)

机构地区：[1]桂林航天工业学院工程综合训练中心,广西桂林541004 [2]桂林航天工业学院汽车工程学院,广西桂林541004

出　　处：《热加工工艺》2025年第3期41-44,50,共5页Hot Working Technology

基　　金：广西高校中青年教师基础能力提升项目(2022KY0798,2023 KY0824)。

摘　　要：采用TIG焊接工艺方法对304/Q345R复合板进行对接焊试验,基层焊缝的填充金属为J50焊丝,过渡层焊缝和覆层焊缝的填充金属均为ER309L焊丝。利用光学显微镜和能谱仪分析了基层焊缝和覆层焊缝的金相组织以及过渡层焊缝邻近位置处的元素分布,并进行了拉伸性能和硬度测试。结果表明,覆层焊缝的组织为细小的γ奥氏体和少量δ铁素体。采用ER309L焊丝能较好地控制铬元素和镍元素的稀释以及碳元素的扩散。焊接接头的抗拉强度满足国家标准要求。从复板304到过渡层焊缝的显微硬度值在190~223 HV范围内波动,过渡层焊缝的硬度值高于基板Q345R。The butt welding test of 304/Q345R composite plate was carried out by using TIG welding process.The filling metal of the base layer weld was J50 welding wire,and the filling metal of the transition layer weld and the cladding layer weld was ER309L welding wire.Optical microscope and EDS were used to analyze the metallographic structure of the base layer weld,the cladding layer weld and the distribution of elements near the weld of the transition layer.The tensile property and microhardness tests were carried out.The results show that the cladding layer weld is fineγaustenite and a small amount ofδferrite.Using the ER309L wire can well control the dilution of Cr and Ni elements and the diffusion of C.The tensile strength of the welded joint meets the national standard requirement.The microhardness from the cladding plate 304 to the transition layer weld fluctuates in the range of 190-223 HV,the hardness of the transition layer weld is higher than that of the substrate Q345R.

关 键 词：304/Q345R复合板 焊丝 元素分布 力学性能 

分 类 号：TG444.74[金属学及工艺—焊接] TB331[一般工业技术—材料科学与工程]