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Laser surface melting of electro-metallurgic WC/steel composites

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Abstract

Laser surface melting was used to treat electro-metallurgic WC/steel composites. The microstructure and properties of the melted zone were investigated. It was found that a homogenous and fine microstructure was formed in the melted zone. A significant phase precipitated was the herringbone eutectic carbide of Fe3W3C. The volume fraction of the eutectics was related to the thermal absorption increasing with the decrease of scanning rate. Preheating was beneficial to form the orientation dendrite structure and to increase the volume fraction of the eutectics. The laser melted surface possessed better microhardness and wear resistance compared to the substrate. The volume fraction of the eutectics played an important role on the wear resistance which increased with the increase of the volume fraction of the eutectics. The wear resistance was mainly depended on the content of the primary WC, as increased with the increase of the content of WC. The improvement of interface bonding, fine eutectic precipitation and structure refinement etc. were regarded as the micro-mechanism of enhancing the surface properties.

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Acknowledgements

We would like to thank the supports of the laboratory center of institute of material science and engineering at Hefei University of Technology. This research was sponsored by the natural science research foundation of department of education of An Hui province in china under Grant NO 2006KG083A.

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Authors and Affiliations

  1. Institute of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, China

    Xianqing You, Chengjun Zhang & Ning Liu

  2. Department of Mechanical and Electrical Engineering, Anhui Architectural Engineering College, Hefei, 230022, China

    M. P. Huang & J. G. Ma

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  1. Xianqing You
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  2. Chengjun Zhang
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  3. Ning Liu
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Correspondence to Xianqing You.

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You, X., Zhang, C., Liu, N. et al. Laser surface melting of electro-metallurgic WC/steel composites. J Mater Sci 43, 2929–2934 (2008). https://doi.org/10.1007/s10853-007-1798-0

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  • DOI: https://doi.org/10.1007/s10853-007-1798-0

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