Structural Changes of Nitrogen Ferrite After Aging in Temperature Interval up to 100 °С
| Autor: | Tatyana MECHKAROVA, Yaroslav ARGIROV, Daniela SPASOVA, Aneliya STOYANOVA |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science, Vol 44, Iss 1 (2021) |
| Druh dokumentu: | article |
| ISSN: | 2668-4748 2668-4756 |
| DOI: | 10.35219/mms.2021.1.04 |
| Popis: | This paper aims to determine the extent of aging of nitrogen ferrite at temperatures below 100 °C and the structural and strength changes that occur in the process. The tests are carried out on samples of technically pure iron (Armco). The specimens are pre-deformed by tension and re-crystallisation heating to achieve a large-grain ferrite structure. A large-grained structure has been chosen to more accurately track the change in micro-hardness of the individual grains during the aging process. Nitric ferrite results from gas carbonitriding and subsequent hardening. Upon hardening, the samples are stored in a refrigerator, and then the surface layer formed is removed through electrochemical corrosion. Afterwards, aging heat treatment at temperatures below 100 °C is undertaken. After the aging process, micro-hardness of the individual grains is examined and X-ray structural analysis is performed. |
| Databáze: | Directory of Open Access Journals |
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