2O3細化了熔覆層的組織,其組織主要由γ-Ni固溶體、Ni3B和高硬度的Cr23C6和Cr7C3組成,平均硬度可達886 HV,抗空蝕性能是Monel400合金的8倍,熔覆層的失效機制均為枝晶干的沖蝕剝落,細晶強化及空蝕過程中產(chǎn)生的阻斷晶界的網(wǎng)狀結(jié)構(gòu)是提高熔覆層耐空蝕性能的關(guān)鍵。"/>

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Monel合金表面激光熔覆Ni基稀土合金空蝕性能
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沈陽工業(yè)大學(xué),沈陽工業(yè)大學(xué),沈陽工業(yè)大學(xué),沈陽工業(yè)大學(xué),沈陽工業(yè)大學(xué),沈陽鼓風(fēng)機集團核電泵業(yè)有限公司,沈陽鼓風(fēng)機集團核電泵業(yè)有限公司,沈陽鼓風(fēng)機集團核電泵業(yè)有限公司

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中圖分類號:

TG178

基金項目:

國家自然科學(xué)基金資助(項目號51271126)；國家重點研發(fā)計劃(2016YFB1100204)；沈陽市科技局計劃項目(F16-032-0-00)


Cavitation erosion properties of Ni-based RE alloy coating on Monel alloy by laser cladding
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Shenyang University of Technology,,Shenyang University of Technology,Shenyang University of Technology,Shenyang University of Technology,Nuclear Power Pump Industry Co Ltd,Shenyang Blower Works Group Corporation,Nuclear Power Pump Industry Co Ltd,Shenyang Blower Works Group Corporation,Nuclear Power Pump Industry Co Ltd,Shenyang Blower Works Group Corporation

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    摘要:

    采用激光熔覆技術(shù)在Monel400合金表面制備Ni基稀土合金熔覆層。利用SEM、EDS、XRD、顯微硬度計及超聲波金屬材料空蝕儀等設(shè)備對熔覆層的組織形貌、相結(jié)構(gòu)、硬度、空蝕性能及失效機制進行了系統(tǒng)研究。結(jié)果表明：Y2O3細化了熔覆層的組織,其組織主要由γ-Ni固溶體、Ni3B和高硬度的Cr23C6和Cr7C3組成,平均硬度可達886 HV,抗空蝕性能是Monel400合金的8倍,熔覆層的失效機制均為枝晶干的沖蝕剝落,細晶強化及空蝕過程中產(chǎn)生的阻斷晶界的網(wǎng)狀結(jié)構(gòu)是提高熔覆層耐空蝕性能的關(guān)鍵。

    Abstract:

    Ni-base RE cladding layer was prepared on Monel 400 alloy by Laser cladding technology. The microstructure, chemical composition, phase identification, hardness distribution, cavitation erosion resistance and failure mechanisms of the modified layer were examined by using SEM, EDS, XRD, microhardness tester and ultrasonic cavitation erosion tester, respectively. The results show that the Y2O3 can refine the grain. The cladding layer was mainly composed of γ-Ni solid solution, Ni3B and the high-hardness carbides (Cr23C6 and Cr7C3). The average hardness of the modified layer can reach 886 HV. The cavitation erosion resistance of Ni-based RE cladding layer was increased by 8 times compared to the Monel 400 alloy. The failure mechanism of the cladding layers is the erosion peeling of the dendrite. Grain refinement strengthening and the net structure blocking grain boundary are the key to improving the cavitation corrosion resistance of the cladding layer.

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張春華,武世奇,何斯文,張松,吳臣亮,關(guān)錳,譚俊哲,崔文東. Monel合金表面激光熔覆Ni基稀土合金空蝕性能[J].稀有金屬材料與工程,2018,47(5):1517~1522.[Zhang Chunhua, Wu SHIqi, He Siwen, Zhang Song, WuChenliang, Guan Meng, Tan Junzhe, Cui Wendong. Cavitation erosion properties of Ni-based RE alloy coating on Monel alloy by laser cladding[J]. Rare Metal Materials and Engineering,2018,47(5):1517~1522.]
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  • 收稿日期:2016-07-05
  • 最后修改日期:2017-04-19
  • 錄用日期:2017-05-15
  • 在線發(fā)布日期: 2018-06-08
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