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灰鑄鐵表面激光熔覆NiCuFeBSi合金層中碳擴(kuò)散形式研究
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總裝“十二五”項(xiàng)目 (51327040401)；國家“973”計(jì)劃項(xiàng)目 (2011CB013403)


Carbon Diffusions in the NiCuFeBSi Alloy Layer Treated by Laser Cladding on Gray Cast Iron
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    摘要:

    在HT250鑄鐵基體上采用Nd:YAG激光器制備了NiCuFeBSi合金熔覆層，研究了熔覆層、半熔化區(qū)、熱影響區(qū)部位的碳元素?cái)U(kuò)散分布形式。結(jié)果表明，在熔覆層內(nèi)部碳元素以細(xì)片石墨、固溶于NiCu固溶體內(nèi)的C原子以及以CO氣體形式存在；而在半熔化區(qū)碳元素則以與Fe形成的介穩(wěn)定相Fe3C和微晶石墨球形式存在；在基體熱影響區(qū)，碳原子從石墨內(nèi)向周圍擴(kuò)散，在極大冷速作用下，碳原子大量過飽和固溶于針狀馬氏體組織內(nèi)，且隨著距結(jié)合界面距離的增加，馬氏體含量逐漸降低，基體石墨熔解程度減弱，呈完整細(xì)片狀

    Abstract:

    A NiCuFeBSi alloy layer was fabricated by laser cladding on HT250 substrate through a Nd:YAG laser. And each carbon structure in the cladding layer, semi-melt zone and heat affected zone (HAZ) was investigated. Results show that carbon distributes in the cladding layers in the form of graphite, CO and C atom solid soluted in [Ni,Cu]. However, carbon distributing in the semi-melt zone are in the form of Fe3C and micro graphite pebble. And in the HAZ, carbon diffuses around graphite and solid solutes in the acicular martensite due to the extremely high cooling rate of molten pool. Moreover, with increasing of the distance to the bonding interface, the content of martensite decreases gradually. Graphite in the substrate fuses less and keeps to be flake

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閆世興,董世運(yùn),徐濱士,王玉江,任維彬,方金祥.灰鑄鐵表面激光熔覆NiCuFeBSi合金層中碳擴(kuò)散形式研究[J].稀有金屬材料與工程,2014,43(9):2182~2186.[Yan Shixing, Dong Shiyun, Xu Binshi, Wang Yujiang, Ren Weibin, Fang Jinxiang. Carbon Diffusions in the NiCuFeBSi Alloy Layer Treated by Laser Cladding on Gray Cast Iron[J]. Rare Metal Materials and Engineering,2014,43(9):2182~2186.]
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  • 收稿日期:2013-09-26
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  • 在線發(fā)布日期: 2015-02-25
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