激光熔覆原位自生Fe-Ti-B系复合涂层物相组织研究

材料热处理学报, 2008, 29(5): 134-138.

激光熔覆原位自生Fe-Ti-B系复合涂层物相组织研究

杜宝帅 ^1, , 邹增大 ^2, , 王新洪 ^3, , 曲士尧 ^4,

1.山东大学材料科学与工程学院,山东济南,250061

2.山东大学材料科学与工程学院,山东济南,250061

3.山东大学材料科学与工程学院,山东济南,250061

4.山东大学材料科学与工程学院,山东济南,250061

基金项目: 高等学校博士学科点专项科研项目(Z2006F07) 高等学校博士学科点专项科研项目(060422020)

关键词：激光熔覆 , 原位自生 , Fe-Ti-B , 钛铁 , 硼铁

Investigation on phase constituents and microstructure of in situ Fe-Ti-B composite coatings fabricated by laser cladding

采用钛铁、硼铁为预置粉末,利用激光熔覆搭接技术在碳钢基体上制备了Fe-Ti-B系原位自生颗粒增强Fe基复合涂层.利用X射线衍射仪、光学显微镜、扫描电镜、电子探针对熔覆层的相组成和显微组织进行了研究,并用洛氏硬度计测量了涂层硬度.结果表明,涂层中原位自生的增强粒子包括TiB2、FeB、Fe2B和Fe2 Ti.且随着涂层中Ti,B原子比例的不同,涂层的相结构发生相应演变.当涂层增强相为FeB+Fe2B+TiB2和TiB2+Fe2Ti时,涂层的塑性降低,在激光熔覆应力的作用下产生裂纹,当涂层增强相为Fe2B+TiB2及TiB2,可获得致密、无缺陷的熔覆层.同被强化基体相比,熔覆层硬度有较大提高,且增强相为FeB+Fe2B+TiB2的涂层具有最高的硬度.

参考文献

[1]	Singh A;Dahotre NB .Laser in-situ synthesis of mixed carbide coating on steel[J].Journal of Materials Science,2004(14):4553-4560.
[2]	H.C. Man;S. Zhang;F.T. Cheng .MICROSTRUCTURE AND FORMATION MECHANISM OF IN SITU SYNTHESIZED TiC/Ti SURFACE MMC ON Ti-6Al-4V BY LASER CLADDING[J].Scripta materialia,2001(12):2801-2807.
[3]	Meng QW;Geng L;Zhang BY .Laser cladding of Ni-base composite coatings onto Ti-6Al-4V substrates with pre-placed B4C+NiCrBSi powders[J].Surface & Coatings Technology,2006(16/17):4923-4928.
[4]	Q. C. JIANG;B. X. MA;H. Y. WANG .Fabrication of steel matrix composites locally reinforced with in situ TiB_2-TiC particulates using self-propagating high-temperature synthesis reaction of Al-Ti-B_4C system during casting[J].Composites, Part A. Applied science and manufacturing,2006(1):133-138.
[5]	Yang S;Chen N;Liu WJ;Zhong ML;Wang Z;Kokawa H .Fabrication of nickel composite coatings reinforced with TiC particles by laser cladding[J].Surface & Coatings Technology,2004(2/3):254-260.
[6]	Wang Xinhong;Zou Zengda;Song Sili;Qu Shiyao .Microstructure and wear properties of in situ TiC/FeCrBSi composite coating prepared by gas tungsten arc welding[J].Wear: an International Journal on the Science and Technology of Friction, Lubrication and Wear,2006(7/8):705-710.
[7]	张锦英,马明星,刘文今,钟敏霖,张伟明,张红军.钒、钛对激光熔覆铁基原位生成颗粒增强复合涂层组织的影响[J].金属热处理,2003(08):1-4.
[8]	Pei YT.;Zuo TC. .Gradient microstructure in laser clad TiC-reinforced Ni-alloy composite coating[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,1998(1/2):259-263.
[9]	Arvind Agarwal;Narendra B. Dahotre .Laser surface engineering of steel for hard refractory ceramic composite coating[J].International Journal of Refractory Metals & Hard Materials,1999(4):283-293.
[10]	Arvind Agarwal;Narendra B. Dahotre .Comparative wear in titanium diboride coatings on steel using high energy density processes[J].Wear: an International Journal on the Science and Technology of Friction, Lubrication and Wear,2000(1/2):144-151.
[11]	A.Agarwal;N.B.Dahotre .Synthesis of boride coating on steel using high energy density processes: comparative study of evolution of microstructure[J].Materials Characterization,1999(1):31-44.
[12]	Darabara M;Papadimitriou GD;Bourithis L .Production of Fe-B-TiB2 metal matrix composites on steel surface[J].Surface & Coatings Technology,2006(6):3518-3523.
[13]	Wang XB.;Yang SL.;Liang Y. .Formation of TiB2 whiskers in laser clad Fe-Ti-B coatings[J].Surface & Coatings Technology,2001(2/3):209-216.
[14]	C. Subramanian;T.S.R.Ch. Murthy;A.K. Suri .Synthesis and consolidation of titanium diboride[J].International Journal of Refractory Metals & Hard Materials,2007(4):345-350.

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