Ni包WC含量对激光熔覆Ni45/Ni-WC复合涂层显微组织与性能的影响
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摘要
利用光纤激光器在Q235钢上激光熔覆Ni包WC粉末增强Ni45合金涂层,系统研究了不同Ni包WC含量下熔覆层组织形貌、稀释率和显微硬度的变化规律。结果表明:WC颗粒受到激光辐照会发生熔解,并与周围元素相互作用形成低熔点共晶。随着Ni包WC含量的增加,熔覆层的稀释率逐渐增大,且熔覆层γ-Ni枝晶持续增多且细化。随着Ni包WC含量的增加,熔覆层的平均显微硬度也逐渐增加,当未添加Ni包WC时,熔覆层显微硬度约为基体的3倍;当Ni包WC质量分数增加到30%时,熔覆层平均显微硬度可达到基体的4倍。
The fiber laser has been used for cladding Ni-WC reinforced Ni-based alloy on Q235 steel. The microstructure,dilution rate and microhardness of the cladding layer with different Ni-WC content were studied systematically. The results showed that WC particles were dissolved by laser irradiation and interact with the surrounding elements to form eutectic with low melting point. The dilution rate and the γ-Ni dendrites content of cladding layer increased gradually with the increase of Ni-WC content. The grain of γ-Ni dendrites was refined at the same time. Meanwhile,the average microhardness of the cladding layer increased as well,which was about three times that of the substrate when weight percent of Ni-WC was 0%; while it can be four times that of the substrate when weight percent of Ni-WC was 30%.
The fiber laser has been used for cladding Ni-WC reinforced Ni-based alloy on Q235 steel. The microstructure,dilution rate and microhardness of the cladding layer with different Ni-WC content were studied systematically. The results showed that WC particles were dissolved by laser irradiation and interact with the surrounding elements to form eutectic with low melting point. The dilution rate and the γ-Ni dendrites content of cladding layer increased gradually with the increase of Ni-WC content. The grain of γ-Ni dendrites was refined at the same time. Meanwhile,the average microhardness of the cladding layer increased as well,which was about three times that of the substrate when weight percent of Ni-WC was 0%; while it can be four times that of the substrate when weight percent of Ni-WC was 30%.
引文
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[8]颜永根,斯松华,张晖,等.激光熔覆Co+Ni/WC复合涂层的组织和磨损性能[J].焊接学报,2007,28(7):21-24.
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[10]Zhou S F,Huang Y J,Zeng X Y.Effects of processing parameters on structure of Ni-based WC composite coatings during laser induction hybrid rapid cladding[J].Applied Surface Science,2009,255:8494-8500.
[11]戎磊,黄坚,李铸国,等.激光熔覆WC颗粒增强Ni基合金涂层的组织与性能[J].中国表面工程,2010,23(6):40-44.
[2]Wu X,Chen G.Microstructural features of an iron-based laser coating[J].Journal of Materials Science,1999,34(14):3355-3361.
[3]Qu P,Ma Y,Zhao J,et al.Microstructure and performance of in-situ synthesis Ti(C,N)-WC/Ni60A matrix composites coating[J].Transactions of the Chinese Society of Agricultural Engieering,2014,30(10):73-81.
[4]吴新伟,曾晓雁.激光熔覆Ni基WC合金组织与硬度变化规律[J].热加工工艺,1997(3):14-16.
[5]成诚,赵剑峰,田宗军,等.激光功率对激光熔覆Ni包WC涂层组织与性能的影响[J].南京航空航天大学学报,2016,48(6):890-894.
[6]刘兴光,王勇,韩彬.激光熔覆Ni包WC复合涂层的组织、耐磨和耐蚀性分析及应用[J].电镀与涂饰,2011,30(5):72-75.
[7]Guo C,Chen J,Zhou J,et al.Effects of WC-Ni content on microstructure and wear resistance of laser cladding Ni-based alloys coating[J].Surface&Coatings Technology,2012,206(8):2064-2071.
[8]颜永根,斯松华,张晖,等.激光熔覆Co+Ni/WC复合涂层的组织和磨损性能[J].焊接学报,2007,28(7):21-24.
[9]Yang S,Chen N,Liu W,et al.Fabrication of nickel composite coatings reinforced with Ti C particles by laser cladding[J].Surface&Coatings Technology,2004,183(2-3):254-260.
[10]Zhou S F,Huang Y J,Zeng X Y.Effects of processing parameters on structure of Ni-based WC composite coatings during laser induction hybrid rapid cladding[J].Applied Surface Science,2009,255:8494-8500.
[11]戎磊,黄坚,李铸国,等.激光熔覆WC颗粒增强Ni基合金涂层的组织与性能[J].中国表面工程,2010,23(6):40-44.