Microstructural Characterization of Expanded Austenite in 304L and 904L Austenitic Stainless Steels

Författare: Giulio Maistro; Chalmers University Of Technology; []

Nyckelord: TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; low-temperature thermochemical treatment; S-phase; SEM; thermal stability; surface engineering; surface analysis; EBSD; XRD; austenitic stainless steel; XPS; GDOES; Expanded austenite;

Sammanfattning: Austenitic stainless steels are among the most used materials in modern industry, mainly because of their superior corrosion resistance. However, low hardness and poor tribological properties often restrict their applicability. Conventional surface hardening techniques such as high-temperature carburizing (T > 850°C) and nitriding (T > 550°C) are not applicable to these alloys. Rapid precipitation of chromium-rich carbides/nitrides at the grain boundaries would in such cases induce chromium depletion in the alloy and compromise the corrosionresistance.Since the middle of the ´80s, low-temperature thermochemical treatments (T

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