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TC4合金表面激光熔覆B4C及B4C＋Ti粉末涂層的微觀組織
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Microstructure of Laser Cladding Coating with Pre-Placed B4C and B4C+Ti Powders on TC4 Substrate
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    摘要:

    利用XRD，SEM和EDS分析手段對B4C和B4C＋10％Ti（質(zhì)量分?jǐn)?shù)，下同）激光熔覆層的微觀組織進行了分析。結(jié)果表明，TC4合金表面B4C與B4C＋10％Ti激光熔覆層的組成相基本相同，均由TiC1-x，TiB，TiB2和Ti相組成，說明在TC4合金表面熔覆過程中有一部分Ti進入熔覆層并與B4C發(fā)生化學(xué)反應(yīng)原位生成了TiB，TiB2和TiC1-x相。TiC1-x相以樹枝狀相形式存在，TiB2相以粗大須狀相形式存在，TiB相以細(xì)小須狀相形式存在。熔覆層與基底結(jié)合良好，沒有發(fā)現(xiàn)裂紋與孔洞?；谉嵊绊憛^(qū)呈淬火組織形貌，為典型的針狀馬氏體組織特征。與B4C激光熔覆層相比，B4C＋10％Ti激光熔覆層的組織細(xì)小，TiB相含量增多，TiB2相含量減少。

    Abstract:

    The microstructure of the laser cladding coating with pre-placed B4C and B4C+Ti powders on TC4 substrate was analyzed using XRD, SEM and EDS. The results showed that both the coatings consisted of TiB2, TiB, TiC1-x and Ti phases. Some of Ti in the substrate was melted and mixed into the laser melting pool and reacted with B4C in-situ producing TiB, TiB2 and TiC1-x. The in-situ produced TiC1-x shows morphology of dendrite. The in-situ produced TiB2 shows morphology of whisker with larger size. The in-situ produced TiB shows morphology of whisker with smaller size. The bonding between the coating and TC4 alloy substrate was perfect. No crack and void were found at the interface. The heat-affected zone in the Ti substrate exhibited typical martensite morphology of quenched microstructure. Compared with B4C cladding coating, the B4C+10wt%Ti cladding coating had a finer microstructure and higher content of TiB phase and lower content of the TiB2 phase.

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田浩 耿林 倪丁瑞 孟慶武. TC4合金表面激光熔覆B4C及B4C＋Ti粉末涂層的微觀組織[J].稀有金屬材料與工程,2007,36(3):420~423.[Tian Hao, Geng Lin, Ni Dingrui, Meng Qingwu. Microstructure of Laser Cladding Coating with Pre-Placed B4C and B4C+Ti Powders on TC4 Substrate[J]. Rare Metal Materials and Engineering,2007,36(3):420~423.]
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  • 最后修改日期:2006-01-20
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