大线能量焊接埋弧焊丝熔敷金属组织和性能研究  

Study on Microstructures and Properties of Deposited Metal of Submerged Arc Welding Wires for High Heat Input Welding

作　　者：王佳骥 李宇梁 韩严法 胡奉雅 傅博 Wang Jiaji;Li Yuliang;Han Yanfa;Hu Fengya;Fu Bo(State Key Laboratory of Metal Materials for Marine Equipment and Application,Anshan 114009,Liaoning,China;Strategic Planning Department of Ansteel Group Corporation Ltd.,Anshan 114009,Liaoning,China)

机构地区：[1]海洋装备用金属材料及其应用国家重点实验室,辽宁鞍山114009 [2]鞍钢集团有限公司战略规划部,辽宁鞍山114009

出　　处：《鞍钢技术》2020年第4期30-34,共5页Angang Technology

摘　　要：设计了不同Ti和B元素添加量的Mn-Ni-Ti-B系大线能量焊接用埋弧焊焊丝,并与SJ101焊剂匹配后进行埋弧焊熔敷金属试验。对熔敷金属的化学成分、力学性能和显微组织进行了检验,用扫描电镜观察其断口形貌,分析了Ti和B元素对焊接熔敷金属冲击韧性的作用。结果表明,设计的焊丝在大线能量焊接下的熔敷金属具有较高的强度和优良的低温冲击韧性;熔敷金属组织主要是由针状铁素体和先共析铁素体组成,不同的Ti和B元素添加量对熔敷金属中针状铁素体和先共析铁素体含量产生一定影响。The submerged arc welding wires with the Mn-Ni-Ti-B series by adding different content of Ti and B elements was designed. After matching the wires with SJ101 flux, the test of the deposited metal by submerged arc welding was carried out. And then the chemical compositions, mechanical properties and microstructures of the deposited metal were inspected.The fracture appearance of the deposited metal was observed with a scanning electron microscope and the effects of Ti and B on its impact toughness were analyzed. The analytical results showed that the deposited metal welded by the designed welding wires under high heat input welding had relatively high strength and excellent low temperature impact toughness. The microstructures of the deposited metal were mainly composed of acicular ferrite and proeutectoid ferrite. Different adding amount of Ti and B elements had a certain effect on the content of acicular ferrite and proeutectoid ferrite in the deposited metal.

关 键 词：大线能量 埋弧焊 针状铁素体 低温冲击韧性 

分 类 号：TG113.2[金属学及工艺—物理冶金]