[Kovove materialy - Metallic materials]
    Mon - October 03, 2022 - 19:56 No. of hits : 1389471 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 39 (2001), Issue 5

Structural stability of duplex stainless steels (in Slovak)
vol. 39 (2001), no. 5, pp. 338 - 348

The effects of precipitation of intermetallic phases on the microstructure, ferrite content and hardness in 22Cr-5Ni-3Mo-0,15N (wt.%) duplex stainless steel (DSS) have been investigated after ageing heat treatment in the temperature range of 400-800 °C for 30 min, 2, 10, and 100 h. During ageing at 400 and 500 °C, the hardness of the ferrite phase increased. The embrittling reaction, termed "475 °C embrittlement", due to the decomposition of the ferrite phase into a Cr-rich, α', and Fe-rich, α was observed. During ageing in the temperature range of 600-800 °C various intermetallic phases precipitated in DSS (σ, χ, γ2, R-phase, chromium carbides and nitrides). The hardness increased and ferrite content decreased with an increase of content of intermetallic phases.

Key words
duplex stainless steel, intermetallic phases, 475 °C embrittlement, ferrite content

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.

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