Fe40-Al60掺杂钨精矿粉激光自蔓延烧结合金组织及性能研究  

Microstructure and properties of Fe40-Al60 composite material blended with tungsten concentrate powder prepared by laser ignition induced SHS

作　　者：李刚[1] 于君娜[1] 罗崇辉[1] 

机构地区：[1]辽宁工程技术大学材料科学与工程学院,辽宁阜新123000

出　　处：《兵器材料科学与工程》2013年第1期57-61,共5页Ordnance Material Science and Engineering

基　　金：辽宁省科学事业公益研究基金计划项目资助

摘　　要：采用不同激光输出功率对掺杂一定含量钨精矿粉末Fe40-A60粉末压坯进行激光点燃自蔓延烧结,利用XRD,SEM,硬度、磨损和耐蚀性测试等表征手段,分析研究引燃功率对烧结合金微观组织结构及宏观性能的影响。结果表明:合金组织为条状组织,且随着引燃功率的增加,组织愈加均匀;产物物相主要为AlCrFe2,AlFe,FeAl3,Al86Fe14,Al5Fe2及硬质颗粒相WO3。当引燃功率为1 100 W,合金的烧结密度最大为4.47 g/cm3,孔隙率最低为4.41%;烧结合金的耐蚀性能最佳,合金的致钝电流密度最小为79.8 mA/cm2,维钝电流密度也最小为0.37 mA/cm2;烧结合金硬度达到最大值,a层为1 309.7HK,b层为1 003HK。当引燃功率为1 000 W,烧结合金的a,b两层相对磨损量最低为0.06,0.05 mg/mm2。Fe40-A160 alloy blended with tungsten concentrate powder was prepared by laser ignition induced SHS with different ignition power. By means of XRD, SEM, hardness test, abrasion test and corrosion resistance test, the influences of laser ignition power on microstructure and macroscopic properties of the sintered alloys were studied. The experimental results show that the microstructure of the sintered alloy is featured with morphological characteristic of strip, and the microstructure becomes even with the increase of laser ignition power. The sintered alloy mainly consists of AlCrFe2, AlFe, FeA13, Al86Fe,4, Al5Fe2, WO3. When the ignition power is 1 100 W, the density of the sintered alloy is the highest, which is 4.47 g/cm3, while the porosity is the lowest, which is 4.41%; the corrosion resistance is the best, and the passivation current density and the induced blunt current density are the lowest, which are 0.37 mA/cm2and 79.8 mA/cm2, respectively; the microhardness of the sintered alloy is the biggest, layer a and b of which is 1 309.7HK and 1 003HK; when the ignition power is 1 000 W, the relative wear rate of the sintered alloy are the lowest, layer a and b of which is 0.06 and 0.05 mg/mm2, respectively.

关 键 词：激光 燃烧合成 钨精矿粉 微观组织 力学特性 

分 类 号：TG156.99[金属学及工艺—热处理]