Mechanical behaviour of pack carburized AISI 316L austenitic stainless steel
| Autor: | S. Kwofie, Lesley H. Chown, L.A. Cornish, D. E. P. Klenam, C. Polese |
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| Rok vydání: | 2015 |
| Předmět: |
Austenite
Toughness Materials science Metallurgy Metals and Alloys engineering.material Geotechnical Engineering and Engineering Geology fractography Hardness 316L austenitic stainless steel mechanical behaviour Carburizing Corrosion pack carburizing Materials Chemistry engineering Austenitic stainless steel Ductility Nitriding |
| Zdroj: | Journal of the Southern African Institute of Mining and Metallurgy, Volume: 115, Issue: 12, Pages: 1183-1191, Published: DEC 2015 |
| ISSN: | 2411-9717 |
| DOI: | 10.17159/2411-9717/2015/v115n12a6 |
| Popis: | structural applications in the petrochemical, telecommunication, aerospace, and foodprocessing industries. This is due to their excellent corrosion resistance and good mechanical properties, such as toughness, ductility, and formability (Bain and Griffiths, 1927; Jenkins et al. 1937; Zapffe, 1949). However, due to the austenitic structure, these steels have quite low surface hardness and poor wear resistance (Bell, 2002; Fewell et al., 2000). To improve the surface properties, diffusion and thermochemical surface treatment techniques such as carburizing (Agarwal et al., 2007; Fewell et al., 2000), nitriding (Bell, 2002), nitro-carburizing (Renevier et al., 1999) and ion implantation (Liang et al., 2007) have been used, without impairing the corrosion resistance of the steel (Bell, 2002; Renevier et al., 1999). The treatment temperatures were kept below 500°C to prevent the formation of chromium carbides and nitrides, which deplete chromium from the matrix and reduce corrosion resistance (Matula et al., 2001). Little has been reported on the pack carburizing of austenitic stainless steels and its effects on the mechanical properties. This is probably because pack carburizing of these stainless steels is considered a difficult process, due to the presence of the Cr2O3 oxide surface layer (Davis, 1994; Mingolo et al., 2006). The tenacious Cr2O3 surface layer serves as an inhibiting barrier and is also selfhealing, which contributes to the ‘stainless’ characteristic of stainless steels. However, it was felt a worthwhile endeavour to ascertain whether this cheaper method could be used. Other forms of carburizing, such as gas and plasma, are normally used for stainless steel rather than pack carburizing, which is more commonly used for mediumand low-carbon steels (Agarwal et al., 2007; Fewell et al., 2000; Renevier et al., 1999). The major parameters that influence carburizing are soaking time, carburizing temperature, and carbon potential (Shewmon, 1963). As a high proportion of mechanical failures are due to fatigue, extensive research is being done in this area (Akita and Tokaji, 2006). Nucleated fatigue cracks grow into macrocracks, resulting in catastrophic failures. Initiation of fatigue is a surface phenomenon, and approximately 80% of all engineering Mechanical behaviour of pack carburized AISI 316L austenitic stainless steel |
| Databáze: | OpenAIRE |
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