2O3; 激光熔覆; 顯微組織細化; 摩擦磨損"/>

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激光熔覆納米La2O3添加鎳基合金涂層的耐磨與顯微組織研究
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西北工業(yè)大學機電學院,西北工業(yè)大學機電學院,西北工業(yè)大學材料學院

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National Natural Science Foundation of China (51075328, 51675424) Fundamental Research Funds for the Central Universities (3102015BJ (II) MYZ28)


Wear Resistance and Microstructure of Laser Cladded Ni-based Coatings with nanometer La2O3 Addition
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School of Mechatronics,Northwestern Polytechnical University,Xi’an,School of Mechatronics,Northwestern Polytechnical University,Xi’an,School of Materials,Northwestern Polytechnical University,Xi’an

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National Natural Science Foundation of China ， Fundamental Research Funds for the Central Universities

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    摘要:

    本研究以激光工藝制備了添加納米La2O3初料的鎳基涂層。激光熔覆之前，高能球磨機充分混合的Ni60A和La2O3粉床預置于基體30CrMnSiNi2A表面。La偏聚于枝晶間從而限制了二次枝晶的成長和熟化。顯微組織得到了細化。由于更高的La富集，涂層上表面顯微組織細化更為顯著，這一現(xiàn)象的上述解釋得到EPMA結果佐證。同時EPMA結果說明Fe稀釋會造成涂層硬度降低。熔覆涂層經過RE顯微組織細化和凈化，硬度、耐磨性均相對基體金屬顯著提升，而涂層中裂紋和孔隙均未出現(xiàn)。Ni60A-La涂層的摩擦系數曲線COF明顯低于基體和Ni60A涂層，Ni60A-La磨擦體積損失率分別少于基體和Ni60A涂層數值的1/10和1/5，顯微硬度值是基體4倍。

    Abstract:

    Ni-based coatings with nano-sized feedstock rare earth element (RE, La2O3) addition were produced by laser cladding. Bed of high energy ball milling mixed Ni60A and La2O3 powders were pre-placed unto the substrate 30CrMnSiNi2A before laser cladding. La segregates in interdendrite thus secondary dendrites growth and ripening are limited. The microstructure is refined. Top surface of cladded coatings displayed better refined microstructure which caused by high La concentration, this phenomena is verified in EPMA results. And the results of EPMA reflected the interconnection between Fe dilution and decrease of coating microhardness. The cracks and pores cannot be found in cladded coatings in which microstructure refinement and purify effect caused by RE is clearly reflected in SEM microstructure, hardness and especially, the wear resistance test results. The COF of Ni60A-La coatings is apparently lower than substrate steel and Ni60A, the wear volume loss rate of Ni60A-La coatings is less than 1/10 that of 30CrMnSiNi2A and 1/5 that of Ni60A, respectively. The microhardness of Ni60A-La is about 4 times higher than that of substrate metal.

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趙寧,陶禮,胡云龍.激光熔覆納米La2O3添加鎳基合金涂層的耐磨與顯微組織研究[J].稀有金屬材料與工程,2017,46(8):2092~2096.[Zhao Ning, Tao Li, Hu Yunlong. Wear Resistance and Microstructure of Laser Cladded Ni-based Coatings with nanometer La2O3 Addition[J]. Rare Metal Materials and Engineering,2017,46(8):2092~2096.]
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歷史
  • 收稿日期:2016-05-07
  • 最后修改日期:2016-10-18
  • 錄用日期:2016-11-10
  • 在線發(fā)布日期: 2017-11-16
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