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Leading Phase in the Directionally Solidifying Fe – 4.25%C Eutectic Alloy

M. Trepczyńska-Łent
Archives of Foundry Engineering | 2019 | vol. 19 | No 4 | 113-116 | DOI: 10.24425/afe.2019.129640
Keywords Directional solidification Fe - C eutectic alloy Solidification front Leading phase
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Abstract

In order to determine the leading phase of the Fe - 4.25% C eutectic alloy, the method of directional crystallization, which allows to study the character of the solid / liquid growth front, was used. Examined eutectic was directionally solidified with a constant temperature gradient of G = 33,5 K/mm and growth rate of v = 125 μm/s (450 mm/h). The Bridgman technique was used for the solidification process. The sample was grown by pulling it downwards up to 30 mm in length. The alloy quenched by rapid pulling down into the Ga-In-Sn liquid metal. The sample was examined on the longitudinal section using a light microscope and scanning electron microscope. The shape of the solid/liquid interface and particularly the leading phase protrusion were revealed. The formation of the concave – convex interface has been identified in the quasi-regular eutectic growth arrested by quenching. The cementite phase was determined to be a leading phase. The total protrusion d is marked in the adequate figure.

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Authors and Affiliations

M. Trepczyńska-Łent
ORCID: ORCID

Characteristics of the Growth of the Directionally Solidified Fe-4.25% C Eutectic Alloy

M. Trepczyńska-Łent
Archives of Metallurgy and Materials | 2021 | vol. 66 | No 4 | 1179-1186 | DOI: 10.24425/amm.2021.140142
Keywords Fe-C eutectic alloy Directional solidification protrusion of leading phase
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Abstract

The current work is dedicated to the mathematical description of a protrusion of the leading phase (cementite) over the wetting phase (austenite) observed during the author’s experiments in previous articles. A cementite protrusion is confirmed in the directionally solidified Fe-4.25% C eutectic alloy. The protrusion is defined due to the mass balance fulfilment. A coordinate system is attached to the solid/liquid interface, which is moving with the constant growth rate v.
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Authors and Affiliations

M. Trepczyńska-Łent
1
ORCID: ORCID
  1. UTP University of Science and Technology, Mechanical Engineering Faculty, Bydgoszcz, Poland

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