线能量对V-N-Ti和Nb-Ti船板焊接接头组织性能的影响  

Effect of heat input welding on microstructure and mechanical property of welded joint in V-N-Ti and Nb-Ti ship buliding steel

作　　者：师仲然 赵庆凯 刘登辉 王天琪 柴锋[1] SHI Zhong-ran;ZHAO Qing-kai;LIU Deng-hui;WANG Tian-qi;CHAI Feng(Department of Structural Steels,Central Iron and Steel Research Institute,Beijing 100081,China;National New Material Production and Application Demonstration Platform(Advanced Marine Engineering and High-tech Ship Materials),Beijing 100081,China;Tianjing Branch,Cnooc China Limited,Tianjin 300452,China)

机构地区：[1]钢铁研究总院工程用钢研究所,北京100081 [2]国家新材料生产示范应用平台(先进海工与高技术船舶材料),北京100081 [3]中海石油(中国)有限公司天津分公司,天津300452

出　　处：《中国冶金》2021年第1期25-30,共6页China Metallurgy

摘　　要：为了验证实验室研究结果,研究了100 kJ/cm线能量对V-N-Ti和Nb-Ti船板焊接接头组织和性能的影响规律。试验结果表明,2种船板钢屈服强度、抗拉强度和伸长率相当,V-N-Ti钢-40℃冲击功显著高于Nb-Ti钢;2种成分钢板焊接接头热影响区-20℃冲击功相当,而V-N-Ti钢焊缝金属冲击功显著低于Nb-Ti钢;V-N-Ti钢粗晶热影响区(CGHAZ)组织为铁素体和贝氏体且其热影响区域较窄,Nb-Ti钢粗晶热影响区组织为贝氏体和少量的晶界铁素体。The effect of the heat input welding of 100 kJ/cm on microstructure and mechanical properties of the welded joint in V-N-Ti and Nb-Ti steel was studied. The results showed that the yield strength, tensile strength and elongation of the two kinds of steel were equivalent, while the impact energy at-40 ℃ of V-N-Ti steel was high than that of Nb-Ti steel. The impact energy at-20 ℃ of the heat-affected zone(CGHAZ) was equivalent to the two kinds of industrial steel, but the impact energy of weld metal of V-N-Ti steel was low than that of Nb-Ti steel. The CGHAZ microstructure of V-N-Ti steel was ferrite and bainite, and the heat-affected zone was narrow. The CGHAZ microstructure of Nb-Ti steel was bainite with a small amount of grain boundary ferrite.

关 键 词：线能量 V-N-Ti钢 Nb-Ti钢 焊接接头 力学性能 多边形铁素体 

分 类 号：TG457.11[金属学及工艺—焊接] U671.8[交通运输工程—船舶及航道工程]