Preparation and Characterization of Nano-SiCP Strengthened MCrAlY Graded Coating by Laser Multi-Layer Cladding

Dong Sheng Wang; Zong Jun Tian; Bin Yang; Li Da Shen

doi:10.4028/www.scientific.net/AMR.557-559.1937

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 557-559Preparation and Characterization of Nano-SiCP...

Preparation and Characterization of Nano-SiC_P Strengthened MCrAlY Graded Coating by Laser Multi-Layer Cladding

Abstract:

Nano-SiC/MCrAlY graded coating was prepared by laser multi-layer cladding on TiAl base intermetallic alloy using composite MCrAlY powders with 1%, 2%, and 3% nano-SiC particles (mass fraction) in turn. The microstructure and microhardness of the composite coating were analyzed by means of scanning electron microscope (SEM) and Vickers microhardness tester. The results show that the microstructure of the composite coating was refined and composed of fine equiaxed grains because of addition of nanometer SiC particles, and the crystal size becomes small with increasing the nano-SiC content in the coating. In addition, due to small size and formation heat of the nano-SiC particles, SiC particles decompose and form new carbides in the coating after laser cladding. The hardness of the composite MCrAlY coating is obviously improved due to enhancement of multi-carbide and refinement of structure.

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Periodical:

Advanced Materials Research (Volumes 557-559)

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1937-1940

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https://doi.org/10.4028/www.scientific.net/AMR.557-559.1937

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Online since:

July 2012

Authors:

Dong Sheng Wang, Zong Jun Tian, Bin Yang, Li Da Shen

Keywords:

Laser Cladding, MCrAlY Graded Coating, Microhardness, Microstructure, Nanometer SiC Particles

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