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Production and Characterization of WC-Reinforced Co-Based Superalloy Matrix Composites

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Tarih
2018
Yazar
Özgün, Ö. and Dinler, İ.
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Özet
Cobalt-based superalloy matrix composite materials were produced through the powder metallurgy technique using element powders at high purity and nano-sized wolfram carbide (WC) reinforcement in this study. An alloy that had the same chemical composition as the Stellite 6 alloy but not containing carbon was selected as the matrix alloy. The powder mixtures obtained as a result of mixing WC reinforcing member and element powders at the determined ratio were shaped by applying 300 MPa of pressure. The green components were sintered under argon atmosphere at 1240 °C for 120 minutes. The densities of the sintered components were determined by the Archimedes’ principle. Microstructural characterization was performed via X-ray diffraction analysis, scanning electron microscope examinations, and energy-dispersive spectrometry. Hardness measurements and tensile tests were performed for determining mechanical characteristics. The relative density values of the sintered components increased by increasing the WC reinforcement ratio and they could almost reach the theoretical density. It was determined from the microstructural examinations that the composite materials consisted of fine and equiaxed grains and coarse carbides demonstrating a homogeneous dispersion along the microstructure at the grain boundaries. As it was the case in the density values, the hardness and strength values of the composites increased by increasing the WC ratio. © 2018, The Minerals, Metals & Materials Society and ASM International.
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https://www.scopus.com/inward/record.uri?eid=2-s2.0-85048014479&doi=10.1007%2fs11661-018-4640-1&partnerID=40&md5=0903ff35a3b29a6c5785364adcef78ed
http://acikerisim.bingol.edu.tr/handle/20.500.12898/4313
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