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斯松华, 袁晓敏, 徐锟, 何宜柱. B4C对激光熔覆钴基合金涂层组织与耐磨性的影响[J]. 焊接学报, 2004, (3): 61-64.
引用本文: 斯松华, 袁晓敏, 徐锟, 何宜柱. B4C对激光熔覆钴基合金涂层组织与耐磨性的影响[J]. 焊接学报, 2004, (3): 61-64.
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SI Song-hua, YUAN Xiao-min, XU Kun, He Yi-zhu. Effect of B4C particles on microstructure and wear resistance of Co-based alloy laser cladding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2004, (3): 61-64.
Citation: SI Song-hua, YUAN Xiao-min, XU Kun, He Yi-zhu. Effect of B4C particles on microstructure and wear resistance of Co-based alloy laser cladding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2004, (3): 61-64.
shu

B4C对激光熔覆钴基合金涂层组织与耐磨性的影响

Effect of B4C particles on microstructure and wear resistance of Co-based alloy laser cladding

    摘要
  • 摘要: 运用5 kW CO2连续激光器在低碳钢表面激光熔覆Co基合金涂层(Co55)及Co基合金中添加20% B4C(体积分数)的复合涂层(B4C/Co),研究了B4C对熔覆层组织、显微硬度及耐磨性的影响。结果表明,两种熔覆涂层均为树状枝晶生长的亚共晶组织。Co55涂层主要由大量初生枝晶γ固溶体及其间的共晶组织γ与(Cr,Fe)7C3组成;B4C/Co涂层主要由γ-Co,Cr7C3,Cr23C6,CrB2和Fe23(C,B)6组成,添加的B4C粒子在熔覆过程中全部熔解,但B4C/Co涂层组织与Co55相比明显细化。B4C/Co涂层的显微硬度及耐磨性比Co55涂层都明显提高,并分析了涂层的强化机理。

     

    Abstract: Laser cladding of Co-based alloy (C5) and Co-basedalloy with 25 vo1% B4C (B4C/Co) on low carbon steel suhstrate has beenobtained by 5 kW CO2 continuous wave laser.The effect of B4C particleson mierostrueture,mierohardness and wear resistance of Co-based alloycoating is investigated.The results show that microstructures of the two coatings were the dendrites of the sub-euteetic structure.Co55 coating isconsisted of "y-Co and (Cr,Fe)7 C3,and B4C/Co coating is consisted of/-Co,Cr7C3,Cr23C6,Fc23(C,B)6 and CrB2.B4C particles had com-pletely dissolved in the Co-based alloy during the laser cladding.Thedendrites of the B4C/Co coatings were much finer than that of the Co55 coating.Mierohardness and sliding wear resistance of the B4C/Co coating were higher than that the Co55 coating.The strengthen mechanism of the coatings is analyzed.

     

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