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http://dx.doi.org/10.4150/KPMI.2017.24.5.370

Manufacturing of Ni-Cr-B-Si + WC/12Co Composite Coating Layer Using Laser Cladding Process and its Mechanical Properties  

Ham, Gi-Su (Department of Materials Science and Engineering, Inha University)
Kim, Chul-O (Vitzrotech Co.)
Park, Soon-Hong (Research Institute of Industrial Science and Technology)
Lee, Kee-Ahn (Department of Materials Science and Engineering, Inha University)
Publication Information
Journal of Powder Materials / v.24, no.5, 2017 , pp. 370-376 More about this Journal
Abstract
In this study we manufacture a Ni-Cr-B-Si +WC/12Co composite coating layer on a Cu base material using a laser cladding (LC) process, and investigate the microstructural and mechanical properties of the LC coating and Ni electroplating layers (reference material). The initial powder used for the LC coating layer is a powder feedstock with an average particle size of $125{\mu}m$. To identify the microstructural and mechanical properties, OM, SEM, XRD, room and high temperature hardness, and wear tests are implemented. Microstructural observation of the initial powder and LC coating layer confirm the layer is composed mainly of ${\gamma}-Ni$ phases and WC and $Cr_{23}C_6$ carbides. The measured hardness of the LC coating and Ni electroplating layers are 653 and 154 Hv, respectively. The hardness measurement from room up to high temperatures of $700^{\circ}C$ result in a hardness decrease as the temperature increases, but the hardness of the LC coating layer is higher for all temperature conditions. Room temperature wear results show that the wear loss of the LC coating layer is 1/12 of the wear level of the Ni electroplating layer. The measured bond strength is also greater in the LC coating than the Ni electroplating.
Keywords
Laser cladding; Ni-Cr-B-Si+WC/12Co; Microstructure; High temperature hardness; Wear;
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