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Influence of Y2O3 Content on Microstructure and Properties of Laser Cladding 0.3C-18Cr Alloy Coating
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1.Lanzhou University of Technology;2.Lan Zhou University of Technology;3.Hardware Knife Cut Industrial Technology Research Institute Yangjiang, Yangjiang

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TG142.1+4

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    Abstract:

    PreparationSofS0.3C18CrScompositeScoatingsSwithSdifferentSY2O3 contentsSonS3Cr14 stainlessSsteelSsubstrateSbySlaserScladdig. The effects of different Y2O3 contents on the microstructure, phase composition and hardness of the cladding layer were studied by metallographic microscope (OM), scanning electron microscope (SEM), X-ray diffraction (XRD) and microhardness tester. The results show that there are many porous holes in the cladding layer without adding Y2O3, and the microstructure of the cladding layer consists of intragranular ferrite, bainite with grain boundary distributed and a small amount of martensite; After adding Y2O3, the dendrite length of the cladding layer is reduced and the number decreases, the dendrite tip is passivated and radially coarsening, the length to diameter ratio decreases, meanwhile the pores of the cladding layer decrease, and the cladding layer is purified. The microstructure of the cladding layer is composed of lath martensite and a small amount of bainite in the grain boundary. With the increase of Y2O3, the lath martensite is slightly coarsened, the number of bainite decreases obviously, the carbon concentration of bainite carbide increases, and the type of lamellar carbides transforms from low carbon carbide to high carbon carbide. After adding Y2O3, the microhardness of the clad layer is significantly improved,; When added 2% Y2O3, the hardening effect of the cladding layer comes up to the best, which was 160 HV0.2 higher than that without adding Y2O3.

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[guotieming, puyabo, zhangruihua, lizilin, liqinag. Influence of Y2O3 Content on Microstructure and Properties of Laser Cladding 0.3C-18Cr Alloy Coating[J]. Rare Metal Materials and Engineering,2019,48(11):3643~3650.]
DOI:10.12442/j. issn.1002-185X.20180413

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History
  • Received:April 24,2018
  • Revised:June 07,2018
  • Adopted:July 30,2018
  • Online: December 10,2019
  • Published: