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WANG Qian, WU Yuping, LI Gaiye, GUO Wenmin. Analysis of silt cavitation erosion resistance of Cr3C2/NiCr coating prepared by high velocity oxy-fuel thermal spraying[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2013, (2): 35-39.
Citation: WANG Qian, WU Yuping, LI Gaiye, GUO Wenmin. Analysis of silt cavitation erosion resistance of Cr3C2/NiCr coating prepared by high velocity oxy-fuel thermal spraying[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2013, (2): 35-39.
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Analysis of silt cavitation erosion resistance of Cr3C2/NiCr coating prepared by high velocity oxy-fuel thermal spraying

  • College of Mechanics and Materials, Hehai University, Nanjing 210098, China

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  • Received Date: December 27, 2011
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  • A Cr3C2/NiCr coating was prepared on 1Cr18Ni9Ti stainless steel by high velocity oxy-fuel (HVOF) thermal spraying. Phases and microstructures of the coating were analyzed by X-ray diffraction (XRD),transmission electron microscope (TEM) and scanning election microscopy (SEM),respectively. The cavitation erosion resistance and silt erosion resistance of the coating were evaluated under two experimental conditions (fresh water and water contained fine silt),and compared with hydro machine material 1Cr18Ni9Ti stainless steel. The result shows that the coating shows a layered structure and contains un-melted particles and some pores. The phases of the coating are composed of Cr3C2,Cr7C3,Cr23C6 and NiCr. The 1Cr18Ni9Ti stainless steel produces the work hardening,which results in the resistance to cavitation erosion. The Cr3C2/NiCr coating exhibits significantly higher microhardness than 1Cr18Ni9Ti stainless steel,which leads to the resistance to silt erosion of the coating. The mass loss of the coating usually happens at the edges of the pores while the cavitation damage of the 1Cr18Ni9Ti stainless steel happens at the grain boundary and twin boundary.
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