Phase and Structural Transformations of High-Carbon Alloy of the Fe–V–C System During Chemical-Thermal Processing and Deformation

O. V. Movchan, K. O. Chernoivanenko

National Metallurgical Academy of Ukraine, 4 Gagarin Ave., UA-49600 Dnipro, Ukraine

Received: 24.08.2018; final version - 26.12.2018. Download: PDF

The regularities of the phase and structural transformations during decarburization of a high-carbon Fe–V–C alloy are studied. The eutectic $L$ → $\gamma$ + VC transformation is established by the geometric thermodynamics method and metallographic analysis. This transformation is accompanied by a diffusion redistribution of the carbide-forming elements ahead of the crystallization front. Decarburization in a liquid–solid state allows forming a favourable structure with VC fibres oriented perpendicularly to the surface in the near-surface zone. Structural changes, which occur under deformation in a liquid–solid state, in preliminary decarburized synthetic vanadium-containing cast iron are investigated. The regularities of structure formation in various diffusion zones during subsequent carburization are revealed. As shown, the subsequent carburization of a pre-decarburized Fe–V–C alloy under special conditions makes it possible to obtain a natural composite with high wear resistance in the surface layer. Secondary hardness and heat resistance of carbonized layer of vanadium-containing cast iron deformed in a liquid–solid state after the final heat treatment are studied.

Key words: Fe–V–C system, decarburization, carburization, diffusion, deformation, crystallization front, eutectic transformation.

URL: http://mfint.imp.kiev.ua/en/abstract/v41/i02/0251.html

DOI: https://doi.org/10.15407/mfint.41.02.0251

PACS: 61.72.Ff, 64.70.D-, 64.70.kd, 81.05.Ni, 81.30.Bx, 81.40.Lm, 81.65.Lp

Citation: O. V. Movchan and K. O. Chernoivanenko, Phase and Structural Transformations of High-Carbon Alloy of the Fe–V–C System During Chemical-Thermal Processing and Deformation, Metallofiz. Noveishie Tekhnol., 41, No. 2: 251—261 (2019)


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