440MPa级HSLA钢焊缝低温韧性分析  

Analysis of weld low temperature toughness of 440 MPa grade HSLA steel

作　　者：曾道平 郑韶先[1] 安同邦[2] 马成勇[2] Zeng Daoping;Zheng Shaoxian;An Tongbang;Ma Chengyong(Lanzhou Jiaotong University,Lanzhou 730070,China;Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]兰州交通大学,兰州730070 [2]钢铁研究总院,北京100081

出　　处：《焊接》2024年第1期33-39,共7页Welding & Joining

摘　　要：采用自制的2种实心焊丝对440 MPa级HSLA钢进行了对接MAG焊(80%Ar+20%CO_(2)),通过对比分析2种焊缝的显微组织和夹杂物尺寸及成分,对2种焊缝低温韧性出现显著差异的原因进行了阐释。结果表明,J1焊丝的焊缝由针状铁素体、侧板条铁素体、先共析铁素体和M-A组元组成,而J2焊丝的焊缝由针状铁素体和M-A组元组成;2种焊丝的焊缝中夹杂物的粒径分布、尺寸、数量和成分差异小,不是导致2种焊缝低温韧性出现显著差异的主要原因;与J1焊丝的焊缝相比,J2焊丝的焊缝中针状铁素体含量升高、M-A组元含量降低、条状和块状M-A组元占比降低,是导致其低温韧性显著优于J1焊丝的主要原因。Butt MAG welding(80%Ar+20%CO_(2))of 440 MPa grade HSLA steel was carried out with two kinds of self-made solid core welding wires.By comparing and analyzing the microstructure,inclusion size and composition of the two kinds of welds,the reasons for the significant difference in low temperature toughness of the two kinds of welds were explained.The results show that the welds of J1 welding wire are composed of acicular ferrite、ferrite side plate、proeutectoid ferrite and M-A constituent,while the welds of J2 welding wire are composed of acicular ferrite and M-A constituent.The particle size distribution,size,quantity and composition of inclusions in the weld of the two kinds of welding wires are small,which is not the main reason for the significant difference in low-temperature toughness between the two kinds of welding wires.Compared with the weld of J1 welding wire,the content of acicular ferrite in the weld of J2 welding wire increases,the content of M-A constituent decreases,and the proportion of strip and block M-A constituent decreases,which is the main reason why its low-temperature toughness is significantly better than that of J1 welding wire.

关 键 词：440 MPa级HSLA钢 显微组织 针状铁素体 M-A组元 低温韧性 

分 类 号：TG422[金属学及工艺—焊接]