合金粉粒埋弧堆焊TiC颗粒增强铁基复合涂层  

TiC particle reinforced Fe-based composite coatings processed by submerged-arc welding adding of alloy powder

作　　者：刘均海[1,2] 黄继华[1] 刘均波[3] 宋桂香[4] 

机构地区：[1]北京科技大学材料学院,北京100083 [2]威海职业学院机电工程系,山东威海264210 [3]潍坊学院机电工程系,山东潍坊261041 [4]威海职业学院技能实训中心,山东威海264210

出　　处：《焊接学报》2010年第12期101-104,共4页Transactions of The China Welding Institution

摘　　要：以TiFe粉、铬粉、镍粉、铁粉、胶体石墨等为原料,利用合金粉粒埋弧堆焊技术在Q235钢表面原位反应合成了TiC颗粒增强铁基复合涂层.无需焊前预热及焊后缓冷,且涂层无裂纹、夹杂、气孔等缺陷.利用SEM,XRD和EDS等试验技术分析了涂层显微组织,并用显微硬度计测试了硬度.结果表明,利用合金粉粒埋弧堆焊技术,可以原位合成细小弥散分布的TiC颗粒,尺寸在2μm以下.TiC颗粒增强铁基复合涂层组织大部分为马氏体组织、少量奥氏体组织和少量TiC颗粒构成.TiC颗粒不仅存在于奥氏体中,也存在于马氏体中.涂层平均显微硬度达601 HV0.2,约是碳钢基体的3倍.TiC particle reinforced Fe-based composites coatings were in situ synthesized on surface of Q235 steel by submerged arc welding of the compacts of mixed ferrotitanium,ferrochromium,iron and carbon powers,etc.The coating was without cracks,inclusions,porosity and other defects,no need to preheat before welding and slow cooling after welding.Microstructures of the coating were observed by scanning electron microscope（SEM）,X-ray diffraction（XRD） and Energy Disperse Spectroscopy（EDS）,and microhardness was measured by microhardness tester.The results indicated that the fine TiC particles were formed by using submerged arc welding process and distributed in the matrix,and the particles sizes were under 2 μm.The microstructure of the coating consisted of TiC particles,martensite and austenite,and the microhardness of the coating was up to 601 HV0.2,which was about 3 times of that of the based metal.

关 键 词：合金粉粒埋弧堆焊 TIC颗粒 涂层 原位合成 

分 类 号：TG425[金属学及工艺—焊接]