Selective dissolution of retained austenite in nanostructured bainitic steels

Kazum, Oluwole, Kannan, Mathan Bobby, Beladi, Hossein, Timokhina, Ilana, Hodgson, Peter, and Khoddam, Shahin (2014) Selective dissolution of retained austenite in nanostructured bainitic steels. Advanced Engineering Materials, 16 (4). pp. 442-444.

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Abstract

Nanostructured bainitic steels, containing bainitic ferrite laths and retained austenite films, formed at two different isothermal temperatures were compared for corrosion behavior in chloride-containing solution using electrochemical techniques. The potentiodynamic polarization results suggest that nanostructured bainite formed at 200 °C exhibits marginally higher corrosion resistance compared with that at 350 °C. Post-corrosion analysis of the galvanostatically polarized samples revealed localized corrosion for both the steels, but the degree of attack was higher in the 350 °C steel than in the 200 °C steel. The localized corrosion attack was due to selective dissolution of the retained austenite phase. The higher volume fraction and larger size of retained austenite in the 350 °C steel as compared to that of the 200 °C steel contributed to the pronounced corrosion attack in the 350 °C steel.

Item ID: 33610
Item Type: Article (Research - C1)
ISSN: 1438-1656
Date Deposited: 11 Jun 2014 00:14
FoR Codes: 09 ENGINEERING > 0912 Materials Engineering > 091207 Metals and Alloy Materials @ 100%
SEO Codes: 86 MANUFACTURING > 8611 Basic Metal Products (incl. Smelting, Rolling, Drawing and Extruding) > 861103 Basic Iron and Steel Products @ 100%
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