Ni对Q690钢SMAW熔敷金属组织和性能的影响  

Effect of Ni on microstructure and properties of SMAW deposited metal on Q690 steel

作　　者：陈建国 杨咏梅[1] 李俐群 王泽军[2] 肖辉英[1] Chen Jianguo;Yang Yongmei;Li Liqun;Wang Zejun;Xiao Huiying(Tianjin Yongchang Welding Wire Co.,Ltd.,Tianjin 300300,China;Tianjin Special Equipment Inspection Institute,Tianjin 300192,China;Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]天津市永昌焊丝有限公司,天津300300 [2]天津市特种设备监督检验技术研究院,天津300192 [3]哈尔滨工业大学,哈尔滨150001

出　　处：《焊接》2021年第7期29-33,40,63,共7页Welding & Joining

摘　　要：以Q690高强钢的焊接材料为研究对象,通过光学数码显微镜、扫描电镜及断口分析等手段研究了Ni含量对焊条电弧焊熔敷金属组织和力学性能的影响。结果表明,固溶强化和细晶强化是熔敷金属的主要强化机制。添加Ni可以有效地改善熔敷金属的组织和力学性能;随着Ni含量的增加,熔敷金属的抗拉强度升高,冲击性能下降;适量的Ni添加,会导致组织中针状铁素体的增多,过量地增加Ni含量,组织中的针状铁素体反而变少,出现贝氏体,甚至马氏体,导致熔敷金属冲击性能恶化。The welding consumables of Q690 high-strength steel were taken as the research object,effects of Ni content on the microstructure and mechanical properties of deposited metal by shielded metal arc welding(SMAW)were studied by means of optical digital microscope,scanning electron microscope and fracture analysis.The results showed that the solution strengthening and fine grain strengthening were the main strengthening mechanism of deposited metals.The addition of Ni could effectively modify the microstructure and mechanical properties of the deposited metal.With the increase of Ni content,the tensile strength of the deposited metal increased while the impact performance decreased.Appropriate amount of Ni addition could cause the increase of acicular ferrite.However,excessive addition of Ni resulted in the decrease of acicular ferrite,and the formation of lath bainite and martensite,which caused the deterioration of the impact properties of the deposited metal.

关 键 词：微观组织 力学性能 Q690钢 Ni含量 

分 类 号：TG406[金属学及工艺—焊接]