Research of Microstructure and Hardness of Co55 and W Coating Made by Laser Cladding

Wei Zhang

doi:10.4028/www.scientific.net/AMR.1120-1121.694

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 1120-1121Research of Microstructure and Hardness of Co55...

Research of Microstructure and Hardness of Co55 and W Coating Made by Laser Cladding

Abstract:

The experiment of laser cladding on the surface of 20 steel was made. The mixed powder of cobalt-based alloy powder (Co55) and tungsten powder was used as cladding material. There were three kinds of weight percent of tungsten powder, 5%, 10% and 15%. The microstructure and hardness of three kinds of laser cladding layer were studied. The microstructure of cladding zone was greatly refined after adding tungsten powder to Co55 powder. When the proportion of tungsten powder was 5%, the cladding zone was made up of dendritic crystal. The average hardness of cladding zone was 590 HV0.2. When the proportion of tungsten powder rose to 10%, there was reticular secondary carbide precipitating along the grain boundary. The average hardness of cladding zone was 648 HV0.2. When the proportion of tungsten powder rose to 15%, much granular carbide would diffusely distribute in Ni-based solid solution. The average hardness of cladding zone was 831 HV0.2.

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Periodical:

Advanced Materials Research (Volumes 1120-1121)

Pages:

694-697

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1120-1121.694

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Online since:

July 2015

Authors:

Wei Zhang*

Keywords:

Cobalt-Based Alloy Powder, Hardness, Laser Cladding, Microstructure, Surface Strengthening, Tungsten Powder

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* - Corresponding Author

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