一种锰镍钼硼合金系埋弧焊丝焊接低碳贝氏体钢接头的组织及性能  

Microstructure and Properties of Low-Carbon Bainitic Steel Joints Welded Using a Mn-Ni-Mo-B Alloy Welding Wire for Submerged-Arc Welding

作　　者：张敏[1] 陈阳阳[1] 杨亮[1] 刘明志[1] 邢奎 

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》2014年第11期26-30,34,共6页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51274162);国家高技术研究发展计划项目(2013AA031303);陕西省教育厅产业化培育项目(2012JC16)

摘　　要：用自行设计的锰镍钼硼合金系焊丝对低碳贝氏体钢进行双面焊;利用光学显微镜、扫描电子显微镜、拉伸和冲击试验机以及显微硬度计等研究了焊接接头的显微组织和力学性能。结果表明:焊缝和热影响区显微组织都主要是针状铁素体和粒状贝氏体;HAZ区组织粗大,存在软化问题;在较小的焊接线热输入条件下,焊接接头强韧性匹配较好,抗拉强度为803.63 MPa,焊缝和热影响区冲击韧性分别为193J和232J。A self-designed Mn-Ni-Mo-B alloy welding wire was used to weld low-carbon bainitic steel by double-sided welding.The microstructure and mechanical properties of the welded joints were studied by optical microscopy,scanning electron microscopy,tensile testing,impact testing and hardness testing.Results show that the microstructure of weld and HAZ were mainly acicular ferrite and granular bainite.The HAZ with coarse grains showed a little softening.Under the condition of relatively small welding line energy,the welded joints had a good matching of strength and toughness.The tensile strength was 803.63 MPa while impact toughness of the weld and HAZ was 193 Jand 232J.

关 键 词：低碳贝氏体钢 焊丝 埋弧焊 显微组织 力学性能 

分 类 号：TG423[金属学及工艺—焊接]