周芳,刘其斌,李栋梁.激光熔覆MoFeCrTiWSix多主元合金涂层组织和性能研究[J].稀有金属材料与工程,2017,46(12):3941~3946.[Zhou Fang,Liu Qibin,Li Dongliang.Study of microstructure and properties of laser cladding MoFeCrTiWSix multi-principal element alloy coatings[J].Rare Metal Materials and Engineering,2017,46(12):3941~3946.]
激光熔覆MoFeCrTiWSix多主元合金涂层组织和性能研究
投稿时间:2015-10-04  修订日期:2015-11-29
中文关键词:  激光熔覆  多主元合金涂层  组织  性能
基金项目:国家自然科学基金(51362004)、贵州省高层次创新型人才培养项目(黔科合人才[2015]4009号)、贵州省科技厅联合基金(黔科合LH字[2014]7605)
中文摘要:
      在Q235钢表面激光熔覆制备了MoFeCrTiWSix(x=0,0.2,0.6,0.8,1.0)多主元合金涂层,采用X射线衍射仪(XRD)、扫描电镜(SEM)和硬度计等系统研究了Si对涂层的组织、相结构、显微硬度及高温抗氧化性能的影响。结果表明:激光熔覆MoFeCrTiW多主元合金涂层为简单BCC结构,组织为等轴晶。添加Si后,涂层主体相仍为BCC结构,当x≥0.4后,会有少量金属间化合物生成,合金涂层由先共晶BCC相和共晶组织(BCC相+Cr5Fe50Mo8.9Si5.2Ti20.4相)组成,随着Si量的增加,先共晶相的形态由胞状树枝晶转变为柱状树枝晶和等轴树枝晶,共晶组织逐渐增多。涂层从表面至结合区的混合熵呈高熵-中熵变化。涂层硬度和900℃时的抗氧化性能随着Si含量的增加有所提高,当x=1时,涂层平均硬度及抗氧化性能最高。
Study of microstructure and properties of laser cladding MoFeCrTiWSix multi-principal element alloy coatings
英文关键词:laser cladding  multi-principal element alloy coatings  microstructure  properties
英文摘要:
      MoFeCrTiWSix (x=0, 0.2, 0.4, 0.6, 0.8, 1.0) multi-principal element alloy coatings were fabricated on Q235 steel by laser cladding. The effect of silicon on the microstructure, phases, microhardness and high-temperature oxidation resistance were investigated systematically by X-ray diffraction (XRD), scanning electron microscopy (SEM) and microhardness tester etc. The results show that, the phase of laser cladding MoFeCrTiW multi-principal element alloy coating is single BCC structure and its microstructure is equiaxed grains. The main phase is still BCC structure after adding different content of silicon into coating. When the content of silicon is no less than 0.4 moles, there exits small intermetallic compound in the coatings, the microstructures of coatings are composed of proeutectic BCC phase and eutectic structure of BCC phase and Cr5Fe50Mo8.9Si5.2Ti20.4 phase. With the content of silicon increasing, the morphology of proeutectic phase changes from cystiform-dendritic to columnar dendrites and equiaxed dendrites, while the content of eutectic structure is increased gradually. From the surface to bonding zone of coatings, the distribution of the mixing entropy changes from high entropy to medium entropy. With the addition of silicon, the microhardness and high-temperature oxidation at 900℃ of coatings are increased. When x is 1.0 mole, both the microhardness and the high-temperature oxidation resistance are the highest.
作者单位E-mail
周芳 贵州大学材料与冶金学院 zhoufang_1974@sina.com 
刘其斌 贵州大学材料与冶金学院 qbliu2@263.net 
李栋梁 贵州大学材料与冶金学院  
摘要点击次数: 535
全文下载次数: 197
查看全文  查看/发表评论  下载PDF阅读器
关闭