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Effect of sintering temperature on the microstructure and machining performance of (Ti, W, Mo, Nb)(C, N)-(Co, Ni) cermets
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College of Materials Science and Engineering, Fuzhou University

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    Abstract:

    In this study, dense Co- and Ni-bonded Ti(C0.6N0.4) matrix cermets with secondary carbides, i.e., WC, Mo2C, and NbC, were prepared using liquid phase sintering in vacuum for 60 min at temperatures ranging from 1410 to 1490°C. The detailed microstructural and phase analysis was performed using scanning electron microscopy, electron probe microanalysis, and X-ray diffraction analysis. The effect of sintering temperature on the microstructure, mechanical properties, and machining performance of cermets was investigated. The results showed that sintering temperature had a significant impact on the microstructural characteristics of (Ti, W, Mo, Nb)(C, N)-(Co, Ni) cermets. The total carbon content of cermets decreased with increase in temperature and a carbon-deficient phase (M6C) was observed in the cermet sintered at 1490°C. The cermets sintered at temperatures of up to 1470°C were composed of an fcc solid solution metal binder and two types of core-rim structured grains, i.e., cubic carbide solution and cubic Ti(C, N) solution phases. The best machining performance on continuous / interrupted turning was found in the cermet sintered at 1470°C because of an optimum combination of hardness and transverse rupture strength.

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[xiang zhong nan, Li Zhan jiang, Huang Shui gen, Chang Fa, Dai Pin qiang. Effect of sintering temperature on the microstructure and machining performance of (Ti, W, Mo, Nb)(C, N)-(Co, Ni) cermets[J]. Rare Metal Materials and Engineering,2021,50(4):1179~1186.]
DOI:10.12442/j. issn.1002-185X.20200228

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History
  • Received:April 06,2020
  • Revised:April 27,2020
  • Adopted:May 08,2020
  • Online: May 08,2021
  • Published: