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Metallurgist

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25-07-2023

Influence of Nitrogen on Chromium Cast Iron Structure and Properties

Authors: P. G. Ovcharenko, R. M. Nikonova, S. A. Tereshkina, A. N. Lubnin

Published in: Metallurgist | Issue 3-4/2023

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Abstract

Structural and phase compositions of castings of chromium cast irons ChKh32 (2–4% C; 30% Cr; 2.4% Mn; 0.6% Si) alloyed with nitrogen using nitrided chromium as a master alloy are studied by X-ray diffraction, metallographic analyses, and scanning electron microscopy methods. It is shown that nitrogen in cast iron obtained is present mainly in iron-based solid solution, along with chromium, manganese and carbon, and is partly included within the composition of carbide phase (Fe, Cr)₇C₃. Nitrogen alloying of ChKh32 (2% C) stabilizes austenite. Nitrogen alloying of ChKh32 (3–4% C) followed by heat treatment leads to formation of an austenitic-martensitic structure with an increase in material hard-ness. It is shown that addition of nitrogen in an amount of 0.2% to ChKh32 (2% C) improves corrosion resistance, and an increase in carbon content in these materials increases abrasive wear resistance.

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Title: Influence of Nitrogen on Chromium Cast Iron Structure and Properties
Authors: P. G. Ovcharenko
R. M. Nikonova
S. A. Tereshkina
A. N. Lubnin
Publication date: 25-07-2023
Publisher: Springer US
Published in: Metallurgist / Issue 3-4/2023
Print ISSN: 0026-0894
Electronic ISSN: 1573-8892
DOI: https://doi.org/10.1007/s11015-023-01531-2

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Metallurgist Volume 67, Number 4