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等離子熔覆原位自生NbC/高熵合金顯微組織研究
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國家自然科學(xué)基金 (51275010)


Microstructure Characterization of in situ NbC/High Entropy Alloys by Plasma Cladding
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    摘要:

    采用等離子熔覆技術(shù)在Q235鋼基體上原位制備了NbC增強(qiáng)的CoCrCuFeNiMn(NbC)x(x=0, 0.05, 0.1, 0.2, 0.3, 0.4)高熵合金熔覆層，并研究了熔覆層的相組成、顯微組織以及顯微硬度。結(jié)果表明，C和Nb的加入并沒有引起熔覆層物相的復(fù)雜化，物相由fcc1相、fcc2相和NbC相組成。NbC大多偏聚于基體的樹枝晶間，少量在樹枝晶內(nèi)析出。NbC的形態(tài)與其含量有關(guān)，當(dāng)x較小時(shí)，NbC呈顆粒狀；當(dāng)x較大時(shí)，NbC呈顆粒狀、長條狀以及十字枝晶狀。原位自生高熵合金復(fù)合材料的硬度較基體合金有了明顯提高，在一定范圍內(nèi)(x=0~0.4)，熔覆層顯微硬度隨增強(qiáng)相含量的升高而增加

    Abstract:

    In situ NbC reinforced CoCrCuFeNiMn(NbC)x (x=0, 0.05, 0.1, 0.2, 0.3, 0.4) high entropy alloys were prepared by plasma cladding on the Q235 steel. The phase constitution, microstructure and microhardness of the cladding layer were investigated. The results show that C and Nb addition doesn’t cause complex phase and the diffraction peaks are composed of fcc1, fcc2 and NbC phase. Most of the NbC is deposited in the interdendrite and a few of them is dendrite. The shape of NbC is related to its content. When x is small, NbC is granular. When x is large, NbC is granular, strip and cross dendritic. Compared with that of the matrix, the hardness of in situ high entropy alloy matrix composite is significantly improved. The hardness of the cladding layer is increased with more NbC in a certain range (x=0~0.4)

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王智慧,王 虎,賀定勇,崔 麗,蔣建敏,周 正,趙秋穎.等離子熔覆原位自生NbC/高熵合金顯微組織研究[J].稀有金屬材料與工程,2015,44(12):3156~3160.[Wang Zhihui, Wang Hu, He Dingyong, Cui Li, Jiang Jianmin, Zhou Zheng, Zhao Qiuying. Microstructure Characterization of in situ NbC/High Entropy Alloys by Plasma Cladding[J]. Rare Metal Materials and Engineering,2015,44(12):3156~3160.]
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  • 收稿日期:2014-12-24
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  • 在線發(fā)布日期: 2016-08-29
  • 出版日期: 2015-12-25