摘要
通过对掺杂钨精矿粉末的Fe40Al60粉末压坯进行激光点燃自蔓延烧结,制备原位自生颗粒增强复合材料。利用表征手段分析钨精矿粉末添加量对烧结合金显微组织结构及宏观性能的影响规律。结果表明,随钨精矿粉含量的增加,合金显微组织由片状变为颗粒状,烧结合金物相主要为Al2O3、FeAl、Fe3Al、Fe7W6、W及硬质颗粒相WO3。当钨精矿粉末含量为1%时,烧结合金密度最大,为4.27 g/cm3;孔隙率最小,为12.2%;硬度最高,上表层区达到1050 HV,中部区达到1818 HV,底层区达到1232 HV;合金磨损率最低,表层区为0.99 mg/mm2,中部区为0.59 mg/mm2,底层区为0.75 mg/mm2;合金耐蚀性能最好,腐蚀电流密度为116μA/cm2。
In-situ particles reinforced composite materials were prepared using Fe40Al60 alloy blended with tungsten concentrate powders by laser ignition induced self-propagating high-temperature synthesis.Influence of content of tungsten concentrate powders on microstructure and properties of the sintered alloys was studided by means of optical microscope,XRD,hardness measurement,wear and corrosion tests.The results show that:the microstructure of the sintered alloy changes from flake to granular as the increase of the content of tungsten concentrate powder.The phases of the sintered alloy mainly consists of Al2O3,AlFe,AlFe3,Fe7W6,W and WO3.When the content of tungsten concentrate powder is 1%,the density of the sintered alloy is the highest,which is 4.27 g /cm3,while the porosity is the lowest,which is 12.2%.The hardness of the sintered alloy is the highest,which is 1050 HV of the upper layer,1818 HV of the middle layer,and 1232 HV of the bottom layer.The relative wear rate of the sintered alloy is the lowest,which is 0.99 mg /mm2 of the upper layer,0.59 mg /mm2 of the middle layer,and 0.75 mg /mm2 of the bottom layer.The corrosion resistance of the sintered alloy is the best,and the corrosion current density is 116 μA /cm2.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第11期11-15,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51274116)
辽宁省自然科学基金(2014020155)
