Fe-15Cr-3.5B-xC堆焊合金微观组织与耐磨性的研究  

Microstructure and wear resistance of Fe-15Cr-3.5B-xC hardfacing alloys

作　　者：蒋德兵 贺定勇[1] 周正[1] 谈震[1] 王国红 

机构地区：[1]北京工业大学材料科学与工程学院,北京100124 [2]北京市生态环境材料及其评价工程技术研究中心,北京100124

出　　处：《焊接》2017年第7期28-31,共4页Welding & Joining

摘　　要：采用CO_2气体保护堆焊的方法,制备了不同碳元素含量的Fe-15Cr-3.5B-xC(x=0.1,0.5,1.0)铁基堆焊合金。采用光学显微镜、XRD,SEM等方法分析了堆焊合金的微观组织结构,并对堆焊合金的宏观硬度和耐磨粒磨损性能进行了测试。结果表明:堆焊合金组织主要由M_2B,Fe_2B,M_(23)(B,C)6,M_3(B,C)和含有铁素体,奥氏体,FeCr固溶体的基体组成。随着碳含量的增加,板条状M_2B型硼化物体积分数逐渐减小。堆焊合金的宏观硬度呈上升趋势,但是耐磨粒磨损性能呈下降趋势。磨粒磨损机制为塑性变形引起的犁沟,硬质相的断裂和脱落。Fe-15Cr-3.5B-xC(x = 0.1,0.5,1.0wt.%) hardfacing alloys with different carbon contents were deposited by flux-cored wire using metal active gas arc welding(MAG).The effects of carbon contents on microstructure of the hardfacing alloy were analyzed by optical microscope,X-ray diffraction(XRD) and scanning electron microscopy(SEM).The macro hardness and wear resistance of hardfacing alloys were tested.The results indicate that Fe-15Cr-3.5B-xC hardfacing alloys consisted of M_2B,Fe_2B,M_(23)(B,C)_6,M_3(B,C) and matrix,which contained ferrite,austenite and Fe-Cr solid solutions.With the increasing carbon content,the volume fraction of plate strip M_2B decreases.Although the hardness of hardfacing alloys is improved,but wear resistance decreases.The main wear mechanism referred to furrows which caused by plastic deformation,brittle fracture and fall off of hard phase.

关 键 词：堆焊合金 显微组织 耐磨粒磨损性能 

分 类 号：TG442[金属学及工艺—焊接]