45CrNiMoVA钢MIG堆焊层组织及性能研究  

Microstructure and Properties of MIG Welded Surfacing Layers on 45CrNiMoVA Steel

作　　者：刘海滨 孟凡军[2] 巴德玛[3] 

机构地区：[1]青岛市锅炉压力容器检验所,青岛262210 [2]装甲兵工程学院装备再制造技术国防科技重点实验室,北京100072 [3]装甲兵工程学院表面工程研究所,北京100072

出　　处：《中国表面工程》2007年第3期39-42,共4页China Surface Engineering

摘　　要：采用脉冲MIG焊技术,用UTP A DUR600耐磨实芯焊丝,在45CrNiMoVA钢基体上堆焊制备了堆焊层;采用扫描电子显微镜对其组织形貌进行了观察分析,并对堆焊层的内聚强度和显微硬度进行了测试。试验结果表明:堆焊层的组织主要为奥氏体和二次渗碳体;焊缝的组织为针状马氏体组织;堆焊层的平均结合强度为695.3MPa;堆焊层的平均显微硬度为HRC58.4,较基体有较大提高,有利于改善材料的耐磨损性能。The welded surfacing layers have been prepared with UTP A DUR600 welding wire by pulse MIG welding technology on 45CrNiMoVA steel, The microstructure of welded surfacing layers was observed by Scanning Electron Microscope （SEM） and the cohesive strength and mircohardness were tested as well. The results showed that the microstructure of welded surfacing layer is mainly composed of austenite and secondary cementite, the microstructure of welding seam is needle-type martensite. The mean cohesive strength of welded surfacing layer is 695.3 MPa, and its mean microhardness （HRC58.4） is obviously higher than that of substrate, which can increase the anti-wear property of material.

关 键 词：MIG焊 堆焊层 组织 性能 

分 类 号：TG44[金属学及工艺—焊接]