Q235钢表面高强铁铬合金熔覆层的制备及性能研究  

Preparation of high-strength iron–chromium alloy cladding coating on Q235 steel surface and study on its properties

作　　者：李聪 陈雪琴 彭道衡 王金凤 LI Cong;CHEN Xue-qin;PENG Dao-heng;WANG Jin-feng(School of Materials Science and Engineering,Hubei University of Automotive Technology,Shiyan 442002,China)

机构地区：[1]湖北汽车工业学院材料科学与工程学院,湖北十堰442002 [2]江苏大学材料科学与工程学院,江苏镇江212013

出　　处：《电镀与涂饰》2019年第17期922-927,共6页Electroplating & Finishing

摘　　要：采用多层多道的CO2气体保护电弧堆焊技术,在Q235表面制备了YD507铁铬合金高强熔覆层,利用光学显微镜、摩擦磨损试验机和显微硬度计研究了基体、界面区和熔覆层的组织与性能。结果表明:在堆焊电流190A、电弧电压22V、焊接速率120m/h的工艺条件下制备的熔覆层结构可靠,缺陷最少。在界面组织中发现了细小的针状马氏体,且晶粒明显细化,故该区域的显微硬度较低,而熔覆层的显微硬度最大可达553HV。磨损试验显示基体磨损面积较大,塑性变形严重,且局部有“剥离坑”产生,而熔覆区由于二次共晶颗粒的出现,因此磨损量明显减少。High-strength YD507 Fe–Cr alloy cladding coatings were prepared on the surface of Q235 steel by multi-layer and multi-pass CO2-shielded arc hardfacing technology. The microstructures and properties of the substrate, interface, and cladding layer were studied by using optical microscope, friction and wear tester, and microhardness tester. The results showed that the cladding layer prepared under the following conditions had a reliable structure with the least defects:hardfacing current 190 A, arc voltage 22 V, and welding speed 120 m/h. Fine needle-shaped martensite and grain refinement were found in the interface region, resulting in a relatively low microhardness in this area. The microhardness was up to 553 HV for the cladding layer. The wear testing showed that the substrate suffered a serious plastic deformation and had a large worn area with some locally distributed "peeling pits". The wear loss of the cladding coating was greatly reduced due to the formation of secondary eutectic particles.

关 键 词：铁铬合金 气保电弧堆焊 熔覆层 微观组织 显微硬度 摩擦磨损行为 

分 类 号：TG475.11[金属学及工艺—焊接] TG455