焊丝药粉中镍铬质量比对双相不锈钢焊缝显微组织与力学性能的影响  

Effects of Ni to Cr Mass Ratio in Flux-Cored Wire Powder on Microstructure and Mechanical Properties of Duplex Stainless Steel Weld Seam

作　　者：张敏[1] 张明[1] 芦晓康 舒绍燕 李继红[1] 

机构地区：[1]西安理工大学材料科学与工程学院,西安710048

出　　处：《机械工程材料》2017年第6期5-9,共5页Materials For Mechanical Engineering

基　　金：陕西省重点实验室项目(15JS082);国家自然科学基金资助项目(51274162);陕西省教育厅服务地方专项(产业化)项目(16JF021)

摘　　要：在CaF_2-SiO_2-TiO_2-CaO系药粉中分别添加质量比为1…1,2…1,3…1的镍、铬元素,以2205不锈钢带为外皮材料制备了自保护药芯焊丝;利用该焊丝对2205双相不锈钢进行了电弧焊,研究了镍铬质量比对焊缝显微组织和力学性能的影响。结果表明:随着镍铬质量比的增大,焊缝中的奥氏体相增多、铁素体相减少,且奥氏体相的尺寸增大;未添加镍、铬元素时,焊缝的强度最高、塑性最差,冲击功最小,为72J;随着镍铬质量比的增大,焊缝强度下降,塑性和冲击功增大;当镍铬质量比为3…1时,焊缝冲击功最高,为150J。The Ni and Cr elements were added in CaF_2-SiO_2-TiO_2-CaO base powder with Ni to Cr mass ratio of 1 ： 1, 2： 1, 3： 1, respectively, then the self-shield flux cored wires were prepared with 2205 stainless steel strip as wrapping material. Using the prepared welding wires, 2205 duplex stainless steel was arc welded, and the effects of Ni to Cr mass ratio on the microstructure and mechanical properties of the weld seam were studied. The results show that with the increase of Ni to （＇r ratio, the austenite phase content in the weld seam increases, the ferrite phase content decreases and the size of austenite phase increases. Without the addition of Ni and Cr elements, tbc strength of the weld seam was the largest while the plasticity was the lowest, and die impact energy was the smallest, which was 72 J. With the increase of Ni to Cr ratio, the strength of the weld seam decreases while the plasticity and impact energy increase. When the mass ratio of Ni to Cr was 3：1, the impact energy of the weld seam had the highest value of 150 J.

关 键 词：自保护药芯焊丝 双相不锈钢 显微组织 力学性能 

分 类 号：TG422.3[金属学及工艺—焊接]