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Proceedings Paper

Fabrication of in-situ composite coating reinforced with TiC particles by powder feeding laser cladding
Author(s): Sen Yang; Minlin Zhong; Wenjin Liu
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Paper Abstract

A composite coating was produced by powder feeding laser cladding. The detailed laser cladding experiments were conducted on a 3kW continuous wave CO2 laser. The diameter of the beam was 3mm, the scanning velocity was 3-10mm/s, and the powder feeding rate was 3.26g/min. The chemical compositions, microstructures and surface morphology of the cladded layer were analyzed using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffractometry (XRD). The experimental results showed that a composites coating with TiC particles of various shapes and sizes embedded in nickel based alloy could be in-situ synthesized from the mixture of nickel based alloy powder, graphite enwrapped with nickel and titanium powders by powder feeding laser cladding. An excellent bonding between the coating and the carbon steel substrate was ensured by the strong metallurgical interface. The coating is uniform, continuous and free from cracks, however there existed some pores in coatings. The microstructure of the coating was mainly composed of ?-Ni dendrite, a small amount of CrB, TiB2, M23C6 and dispersed TiC particles. The maximum microhardness of the coating was about HV021 100 after laser surface remelting .4.5 times larger than that of the steel substrate.

Paper Details

Date Published: 12 September 2002
PDF: 8 pages
Proc. SPIE 4915, Lasers in Material Processing and Manufacturing, (12 September 2002); doi: 10.1117/12.482865
Show Author Affiliations
Sen Yang, Tsinghua Univ. (China)
Minlin Zhong, Tsinghua Univ. (China) and Inner Mongolia Polytechnic Univ. (China)
Wenjin Liu, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 4915:
Lasers in Material Processing and Manufacturing
ShuShen Deng; Tatsuo Okada; Klaus Behler; XingZong Wang, Editor(s)

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