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Carbide composition change during liquid phase sintering of a wear resistant alloy

  • Symposium on Activated and Liquid Phase of Refractory Metals and Their Compounds
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Abstract

Constitutive liquid phase sintering is used to obtain fully dense parts of powdered STELLITE Alloy No. 6 PM (Co-29Cr-4.5W-l.2C- < 1B) with excellent wear resistance at elevated temperature. This alloy is characterized by a cobalt-rich fcc solid solution and interdendritic carbide phases in the as-atomized state. Compositional changes in the carbides prior to, and during, the liquid phase sintering were investigatedvia X-ray diffraction, optical microscopy, and Auger electron spectroscopy. The rejection of boron and cobalt by an M23C6-type carbide was identified as leading to the local formation of the liquid phase. A mechanism for the interactive role of the carbide composition change and the constitutive liquid phase sintering is proposed.

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This paper is based on a presentation delivered at the symposium “Activated and Liquid Phase Sintering of Refractory Metals and Their Compounds” held at the annual meeting of the AIME in Atlanta, Georgia on March 9, 1983, under the sponsorship of the TMS Refractory Metals Committee of AIME.

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Mcginn, P.J., Kumar, P., Miller, A.E. et al. Carbide composition change during liquid phase sintering of a wear resistant alloy. Metall Trans A 15, 1099–1102 (1984). https://doi.org/10.1007/BF02644703

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