Influence of nitrogen on chromium cast iron structure and propertiesстатья
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Дата последнего поиска статьи во внешних источниках: 20 июня 2024 г.
Аннотация: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 hardness. 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.