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Comparative study of the corrosion behaviour of plasma nitrocarburised AISI4140 steel before and after post-oxidation
AbstractIn this study, the corrosion behaviour of plasma nitrocarburised AISI4140 steel before and after post-oxidation was investigated. Plasma nitrocarburising was carried out at 530°C, 570°C and 630°C for 5h in an atmosphere consisting of 80vol.% N2, 17vol.% H2 and 3vol.% CO2. After nitrocarburising, plasma post-oxidation was performed at 450°C for 1h in a gas mixture of 50vol.% O2 and 50vol.% H2. The microstructure of the treated samples was characterized using X-ray diffraction, scanning electron microscopy and surface roughness techniques. Dynamic polarization test was also used to evaluate the corrosion resistance of the samples. The results indicated that the compound layer was composed of &z.epsiv;-Fe2–3(N,C) and γ′-Fe4(N,C) phases. The amount of &z.epsiv;-Fe2–3(N,C) phase increased as the treatment temperature rose from 530°C to 570°C and decreased at 630°C. The X-ray diffraction patterns of post-oxidized samples confirmed the formation of the highest amount of magnetite after post-oxidation of samples that had been nitrocarburised at 570°C as compared with the samples that had been treated at 530°C and 630°C. Nitrocarburising at 570°C followed by post-oxidation also provided the highest corrosion resistance among all treatment conditions.
Comparative study of the corrosion behaviour of plasma nitrocarburised AISI4140 steel before and after post-oxidation
AbstractIn this study, the corrosion behaviour of plasma nitrocarburised AISI4140 steel before and after post-oxidation was investigated. Plasma nitrocarburising was carried out at 530°C, 570°C and 630°C for 5h in an atmosphere consisting of 80vol.% N2, 17vol.% H2 and 3vol.% CO2. After nitrocarburising, plasma post-oxidation was performed at 450°C for 1h in a gas mixture of 50vol.% O2 and 50vol.% H2. The microstructure of the treated samples was characterized using X-ray diffraction, scanning electron microscopy and surface roughness techniques. Dynamic polarization test was also used to evaluate the corrosion resistance of the samples. The results indicated that the compound layer was composed of &z.epsiv;-Fe2–3(N,C) and γ′-Fe4(N,C) phases. The amount of &z.epsiv;-Fe2–3(N,C) phase increased as the treatment temperature rose from 530°C to 570°C and decreased at 630°C. The X-ray diffraction patterns of post-oxidized samples confirmed the formation of the highest amount of magnetite after post-oxidation of samples that had been nitrocarburised at 570°C as compared with the samples that had been treated at 530°C and 630°C. Nitrocarburising at 570°C followed by post-oxidation also provided the highest corrosion resistance among all treatment conditions.
Comparative study of the corrosion behaviour of plasma nitrocarburised AISI4140 steel before and after post-oxidation
Heydarzadeh Sohi, M. (author) / Ebrahimi, M. (author) / Honarbakhsh Raouf, A. (author) / Mahboubi, F. (author)
2010-04-10
6 pages
Article (Journal)
Electronic Resource
English
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