The Structure and Phase Composition Acquired by Fe–Ti–Ni–C Alloys in Thermal Synthesis
| Autor: | G. A. Maksimova, G. A. Bagliuk, A. A. Mamonova, D. A. Goncharuk |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Titanium carbide
Materials science Cementite Metals and Alloys Intermetallic chemistry.chemical_element Sintering 02 engineering and technology Condensed Matter Physics Hot pressing 030226 pharmacology & pharmacy Carbide 03 medical and health sciences chemistry.chemical_compound Nickel 020303 mechanical engineering & transports 0302 clinical medicine 0203 mechanical engineering chemistry Chemical engineering Mechanics of Materials Materials Chemistry Ceramics and Composites Solid solution |
| Zdroj: | Powder Metallurgy and Metal Ceramics. 59:171-178 |
| ISSN: | 1573-9066 1068-1302 |
| Popis: | The structure and phase composition of Fe–Ti–Ni–C alloys produced in situ by thermal synthesis at 1200°C using TiH2, Fe, graphite, and Ni powder mixtures have been studied. The synthesized alloys represent a skeleton of titanium carbide grains of different stoichiometry, with sizes varying from 0.5 to 16 μm, surrounded by metal reinforcement layers. The starting mixtures without nickel or with 5% Ni have coarse TiC grains. When Ni content of the mixture increases to 10–20%, the maximum grain size sharply decreases to 6–7 μm. The microhardness of the synthesized alloys decreases when nickel amount in the mixture increases to 15% but becomes somewhat higher at 20% Ni. The phase composition of the alloys substantially depends on the amounts of starting mixture components and includes titanium carbide, Fe3C cementite, α-iron solid solution, and intermetallic FeNi3 (for ironcontaining mixtures) and Ni3Ti and Ni4Ti (for nickel-containing mixtures). When Ni content of the starting mixture increases to 10–20%, the lattice parameter and stoichiometry of TiCx slightly decrease and carbide particles noticeably refine. The thermally synthesized alloys have been ground to produce reinforced steel composite powders, which can find extensive application in depositing wear-resistant coatings and fabricating bulky parts by compaction followed by sintering, hot pressing, or hot forging. |
| Databáze: | OpenAIRE |
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