李振团,邢淑清,麻永林,陈重毅,陆恒昌,韩娜

• 1:内蒙古科技大学材料与冶金学院

摘要(Abstract)：

采用实芯80%Ar+20%CO2气体保护焊对40 mm厚S620Q桥梁用钢板进行多层多道焊接,利用光学显微镜和扫描电镜等分析手段研究焊接接头组织及力学性能。结果表明,从X形焊根到盖面焊道,焊缝组织由针状铁素体(AF)+粒状贝氏体(GB)转变为粗大AF+GB,强度先增大后减小。粗晶热影响区(CGHAZ)主要组织为板条状贝氏体、马氏体和GB。二次热循环温度在(α+γ)临界区时,粗晶区晶界处生成了不规则、岛状M-A和贝氏体,部分淬火区晶界处为GB。-20℃接头CGHAZ冲击韧性值高于焊缝,焊缝断口形貌为韧窝+少量解理,CGHAZ纤维区为大的韧窝,放射区为解理+少量韧窝,在小的撕裂刻面上有二次裂纹。CGHAZ晶界处不规则、岛状M-A对韧性损害较小,脆性解理断裂起源于晶内,而不是晶界。

关键词(KeyWords)： 焊接接头;针状铁素体;多层焊接;力学性能;断口形貌

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项子课题(2009ZX04014-064-05)

作者(Author): 李振团,邢淑清,麻永林,陈重毅,陆恒昌,韩娜

DOI: 10.13289/j.issn.1009-6264.2015.06.022

参考文献(References)：

• [1]刘文月,任毅,张帅,等.二次热循环对X100管线钢粗晶热影响区组织与性能的影响[J].材料热处理学报,2012,33(3):99-102.LIU Wen-yue,REN Yi,ZHANG Shuai,et al.Influence of secondary welding thermal cycle on microstructure and property of coarse grain heat-affected zone in an X100 pipeline steel[J].Transactions of Materials and Heat Treatment,2012,33(3):99-102.
• [2]李贞顺,李胜利,朱新德,等.热循环方式对Q690 TMCP钢粗晶区组织和性能的影响[J].材料热处理学报,2014,35(2):121-125.LI Zhen-shun,LI Sheng-li,ZHU Xin-de,et al.Effects of weld thermal cycle modes on microstructure and properties of coarse-grained heat-affected zone of Q690 steel processed by TMCP[J].Transactions of Materials and Heat Treatment,2014,35(2):121-125.
• [3]王学,常建伟,黄关政,等.WB36钢临界再热粗晶区组织性能[J].焊接学报,2008,29(10):29-32.WANG Xue,CHANG Jian-wei,HUANG Guan-zheng,et al.Study on microstructure and properties of IRCGHAZ in WB36 steel[J].Transactions of the China Welding Institution,2008,29(10):29-32.
• [4]Mukhopadhyay S,Pal T K.Effect of shielding gas mixture on gas metal arc welding of HSLA steel using solid and flux-cored wires[J].The International Journal Advaced Manufacturing Technology,2006,29(3/4):262-268.
• [5]Subramanian S V,Prikryl M,Gaulin B D,et al.Effect of precipitate size and dispersion on toughness of heat-affected zone of 800 MPa grade low alloy steel[J].Acta Metallurgica Sinica,2005,41(4):392.
• [6]潘鑫,张宇,王银柏,等.690 MPa级双丝埋弧焊接头的组织与性能[J].金属热处理,2014,39(8):35-40.PAN Xin,ZHANG Yu,WANG Yin-bai,et al.Microstructure and mechanical properties of 690 MPa weld joint by tandem submerged arc welding[J].Heat Treatment of Metals,2014,39(8):35-40.
• [7]方洪渊.焊接结构学[M].北京:机械工业出版社,2008:130-135.
• [8]Zhang X Y,Gao H L.A study of impact toughness of inter-critically reheated coarse-grain heat effected zone of two type X80 grade pipeline steel[J].Transaction of JWRI,2011,40(S):101-104.
• [9]Davis C L,King J E.Effect of cooling rate on intercritically reheated microstructure and toughness in high strength low alloy steel[J].Materials Science and Technology,1993,9(1):8-15.
• [10]廖波,肖福仁.针状铁素体管线钢组织及强韧化机理研究[J].材料热处理学报,2009,30(2):58-62.LIAO Bo,XIAO Fu-ren.Research on microstructure and strength-toughening mechanism of acicular ferrite pipeline steel[J].Transactions of Materials and Heat Treatment,2009,30(2):58-62.
• [11]亓效刚,陈茂爱,陈俊华,等.Ti-Nb微合金钢中第二相粒子对CGHAZ组织及韧性的影响[J].机械工程学报,2005,41(6):86-92.QI Xiao-gang,CHEN Mao-ai,CHEN Jun-hua,et al.Effect of second phase particles on microstructure and toughness of CGHAZ in Ti-Nb microalloyed steel[J].Journal of Mechanical Engineering,2005,41(6):86-92.
• [12]闫久春,杨建国,张广军译.焊接冶金学[M].北京:高等教育出版社,2012:195-198.

文章评论(Comment)：