Abstract
The paper deals with the laser cladding application to improve wear properties of cutting edges, making use a fiber laser source. This type of laser is chosen due to the small dimension of the clad cross section that has to be rebuilt. The paper is aimed at obtaining good cladding layers using high content of WC as reinforcement phase, which mainly means a clad free of cracks and pores. In order to obtain very high hardness values of the clad surface, the deposited material is constituted by an high percentage of tungsten carbides (over 85% in weight), while the matrix is a standard cobalt powder. A preliminary experimental campaign allowed to investigate the process parameters which mainly affect the clad quality in terms of pores and cracks absence. Then the role of the three most affecting parameters, i.e. laser speed, laser power and shielding gas, was highlighted in order to better investigate the overall clad attributes, such as micro-hardness, geometry, integrity (pores and cracks) and dilution with the substrate steel. As a result, improved work condition is found, which produces clad with no pores, no crack and high hardness.
References
L. Santo. Laser cladding of metals: A review. International Journal of Surface Science and Engineering, 2, 5, 327-336, 2008.
C.P. Paul, H. Alemohammad, E. Toyserkani, A. Khajepour and S. Corbin. Cladding of WC-12 Co on low carbon steel using a pulsed Nd:YAG laser. Material Science and Engineering, A 464: 170-176, 2007.
M.A. Pinto, L. Costa, R. Colaco, R. Vilar and M.C.F. Ierardi. Characterization of laser cladding WC-Co composite coatings. In Anais do 58DG Congresso Anual da Associacao Brasileira de Metalurgia e Materiais, pp. 3421-3430, 2003.
S.W. Huang, M. Samandi and M. Brandt. Abrasive wear performance and micorstructure of laser clad WC/Ni layers. Wear, 256: 1095-1105, 2004.
Y. Yang and H.C. Man. Micorstructure evolution of laser clad layers of W-C-Co alloy powders. Surface and Coatings technology, 132: 130-136, 2000.
M. Zhong, W. Liu, K. Yao, J.C. Goussain, C. Mayer and A. Becker. Microstructural evolution in high power laser cladding of stellite 6 + WC layers. Surface and Coatings Technology, 157: 128-137, 2002.
G. Bi, X. Zhang and I. R. Pashby. Study on the deposition of Ni-base waspaloy powder via high power fiber laser. In 2008 IEEE PhotonicsGlobal@Singapore (IPGC), 1-4, 2008.
S. Nowotny, S. Scharek and A. Schmidt. Advanced laser technology applied to cladding [surfacing] and buildup. Welding Journal, 86(5): 48-51, May 2007
Z. Z. Fang, X. Wang, T. Ryu, K.S. Kwang, H.Y. Sohn. Synhthesis, sintering and mechanical properties of nanocrystalline cemented tungsten carbide – A review. Int. Journal of Refractory Metals & Hard Materials, 27: 288-299, 2009
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Valsecchi, B., Previtali, B., Vedani, M. et al. Fiber Laser Cladding with High Content of WC-Co Based Powder. Int J Mater Form 3 (Suppl 1), 1127–1130 (2010). https://doi.org/10.1007/s12289-010-0970-2
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DOI: https://doi.org/10.1007/s12289-010-0970-2