Mechanical Properties of Sintered Iron Sheets Containing Reduced Iron Powder with Gangue
| Autor: | Keizo Nishida, Sogo Sayama, Yoshikazu Suzuki |
|---|---|
| Rok vydání: | 1980 |
| Předmět: |
Mill scale
Materials science Hydrogen Annealing (metallurgy) Metallurgy General Engineering Metals and Alloys Oxide chemistry.chemical_element Direct reduced iron engineering.material Condensed Matter Physics Iron powder chemistry.chemical_compound chemistry Iron ore Ultimate tensile strength Materials Chemistry engineering Gangue Physical and Theoretical Chemistry |
| Zdroj: | Tetsu-to-Hagane. 66:372-381 |
| ISSN: | 1883-2954 0021-1575 |
| DOI: | 10.2355/tetsutohagane1955.66.3_372 |
| Popis: | Sintered iron sheets containing gangue minerals were produced from iron powder reduced by means of fluidized bed. Effect of gangue from iron ore on the mechanical properties of sintered iron sheets was examined using various oxides. Reduced iron powder was carefully mixed with pure iron powder up to 50wt%. The mixed powder after pressing was sintered in hydrogen at 850°C or 900°C for 1hr, rolled and annealed at 700°C or 850°C for 1hr. Then, the effect of gangue oxides dispersed in the sintered iron sheets on the mechanical properties was examined. As the content of oxides in the sheets increased, the yield stress and tensile strength increased, while the elongation decreased. After a high temperature annealing in hydrogen, the elongation improved because of a decrease in the oxygen content of sheet, while the strength decreased owing to reduction of oxides during heat treatment.The oxides changed into glassy ones during reduction. Oxide layers were found in parallel to the rolled surface of iron sheet. The oxides contained in sintered iron sheets are effective to increase the tensile strength of sheets when they are treated at comparatively low temperatures (700°C or 850°C). It seems to be due to the formation of fine oxide particles in the matrix by rolling.I. Introduction |
| Databáze: | OpenAIRE |
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