Ti、B对780 MPa级焊缝金属组织相变的影响  

Effect of Ti and B on microstructure transformation of 780 MPa grade weld metal

作　　者：宋峰雨 刘思远 张元祥[3] SONG Feng-yu;LIU Si-yuan;ZHANG Yuan-xiang(College of Physics,Mechanical and Electrical Engineering,Longyan University,Longyan 364012,China;Haicheng New Material Technology Co Ltd,Tianjin 300384,China;The State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China)

机构地区：[1]龙岩学院物理与机电工程学院,福建龙岩364012 [2]海程新材料科技有限公司,天津300384 [3]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《材料热处理学报》2020年第11期173-178,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51801022);龙岩学院青年博士科研启动基金资助项目(No.LB201810)。

摘　　要：采用实验室气体保护焊焊接制备了3种不同成分的780 MPa级高强度焊缝金属,分析了Ti、B对780 MPa级焊缝金属组织相变的影响。结果表明:在Si、Mn系焊缝金属中,板条贝氏体组织在奥氏体晶界形核并平行排列;当焊缝金属中添加Ti元素后,夹杂物变为由Mn、Si、Ti的氧化物组成,并成为板条贝氏体组织形核的起点,板条贝氏体组织彼此交叉排列;在此基础上继续添加B元素,夹杂物中Ti氧化物所占比重有所增加,板条贝氏体组织再次回归到平行排列的状态。Three 780 MPa grade weld metals with different composition were prepared in laboratory by gas shielded welding, and the effect of Ti, B on microstructure transformation of the 780 MPa grade weld metals was analyzed. The results show that the lath bainite structure is nucleated and arranged parallelly at the austenite grain boundary in the Si, Mn series weld metal. When the Ti element is added to the weld metal, the inclusions are composed of the Mn, Si, Ti oxide and becomes the nucleation site of the lath bainite, and the lath bainite is cross-arranged with each other. When the Ti and B elements are added to the weld metal, the proportion of Ti oxide in the inclusions increases, and the lath bainite returns to the parallel arrangement.

关 键 词：焊缝金属 板条贝氏体 夹杂物 

分 类 号：TG444[金属学及工艺—焊接]