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Precipitation of Chromium Nitrides in the Super Duplex Stainless Steel 2507
RISE, Swerea, Swerea KIMAB.
Jernkontoret - The Swedish Steel Producers’ Association.
RISE, Swerea, Swerea KIMAB.
2015 (English)In: Metallurgical and Materials Transactions. A, ISSN 1073-5623, E-ISSN 1543-1940, Vol. 46, no 3, 1062-1072 p.Article in journal (Refereed)
Abstract [en]

Precipitation of chromium nitrides during cooling from temperatures in the range 1373 K to 1523 K (1100 °C to 1250 °C) has been studied for the super duplex stainless steel 2507 (UNS S32750). Characterization with optical, scanning and transmission electron microscopy was combined to quantify the precipitation process. Primarily Cr2N nitrides were found to precipitate with a high density in the interior of ferrite grains. An increased cooling rate and/or an increased austenite spacing clearly promoted nitride formation, resulting in precipitation within a higher fraction of the ferrite grains, and lager nitride particles. Furthermore, formation of the meta-stable CrN was induced by higher cooling rates. The toughness seemed unaffected by nitrides. A slight decrease in pitting resistance was, however, noticed for quenched samples with large amounts of precipitates. The limited adverse effect on pitting resistance is attributed to the small size (~200 nm) of most nitrides. Slower cooling of duplex stainless steels to allow nitrogen partitioning is suggested in order to avoid large nitrides, and thereby produce a size distribution with a smaller detrimental effect on pitting resistance. © 2014, The Minerals, Metals & Materials Society and ASM International.

Place, publisher, year, edition, pages
2015. Vol. 46, no 3, 1062-1072 p.
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-12793DOI: 10.1007/s11661-014-2718-yScopus ID: 2-s2.0-84925483443OAI: oai:DiVA.org:ri-12793DiVA: diva2:972986
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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