Issues »  Volume 39, Issue 11

Regularities of Phase and Structural Transformations During Liquid-Phase Sintering of Powder High-Speed Steel

O. V. Movchan, K. O. Chernoivanenko

National Metallurgical Academy of Ukraine, 4 Gagarin Ave., 49600 Dnipropetrovs’k, Ukraine

Received: 03.10.2017. Download: PDF

The regularities of the phase and structural transformations with diffusive composition changing are investigated in the pressed powder mixture of alloys, in which the concentration of the alloying elements is similar to standard high-speed steel, but with different carbon content. In one component of the mixture, the concentration of carbon is not more than 0.2%; in another one, it is closed to the eutectic value ($\cong$ 3.8%). The method of geometrical thermodynamics is used to determine the diffusion flows during aligning the concentration of carbon in the powder mixture under heating and exposure at temperature, which is higher than a melting temperature of the eutectic. The regularities of the carbide-phase transformation in the sintering process are revealed depending on its volume fraction and duration of exposure.

Key words: mixture of powders, high-speed steel, liquid-phase sintering, multiphase transformation, structure formation, crystallization, eutectic, geometrical thermodynamics, diffusion, Stefan problem, spheroidization.

URL: http://mfint.imp.kiev.ua/en/abstract/v39/i11/1469.html

DOI: https://doi.org/10.15407/mfint.39.11.1469

PACS: 64.60.dg, 66.30.Fq, 81.05.Ni, 81.05.Rm, 81.20.Ev, 81.30.Bx, 81.30.Fb

Citation: O. V. Movchan and K. O. Chernoivanenko, Regularities of Phase and Structural Transformations During Liquid-Phase Sintering of Powder High-Speed Steel, Metallofiz. Noveishie Tekhnol., 39, No. 11: 1469—1479 (2017) (in Russian)

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