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Application of computational thermodynamics to microstructure and properties of stainless steels
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: US-AB , 2010. , [44] p.
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-27715ISBN: 978-91-7415-762-8 (print)OAI: oai:DiVA.org:kth-27715DiVA: diva2:379959
Presentation
2010-10-28, Sal B2, KTH, Brinellvägen 23, Stockholm, 14:00 (English)
Opponent
Supervisors
Note
QC 20101220Available from: 2010-12-20 Created: 2010-12-20Bibliographically approved
List of papers
1. On Phase Equilibria in Duplex Stainless Steels
Open this publication in new window or tab >>On Phase Equilibria in Duplex Stainless Steels
2010 (English)In: STEEL RES INT, ISSN 1611-3683, Vol. 81, no 5, 337-346 p.Article in journal (Refereed) Published
Abstract [en]

The equilibrium conditions of four duplex stainless steels; Fe-23Cr-4.5Ni-0.1N, Fe-22Cr-5.5Ni-3Mo-0.17N, Fe-25Cr-7Ni-4Mo-0.27N and Fe-25Cr-7Ni-4Mo-1W-1.5Cu-0.27N were studied in the temperature region from 700 to 1000 degrees C. Phase compositions were determined with SEM EDS and the phase fractions using image analysis on backscattered SEM images. The results showed that below 1000 degrees C the steels develop an inverse duplex structure with austenite and sigma phase, of which the former is the matrix phase. With decreasing temperature, the microstructure will be more and more complex and finely dispersed. The ferrite is, for the higher alloyed steels, only stable above 1000 degrees C and at lower temperatures disappears in favour of intermetallic phases. The major intermetallic phase is sigma phase with small amounts of chi phase, the latter primarily in high Mo and W grades. Nitrides, not a focus in this investigation, were present as rounded particles and acicular precipitates at lower temperatures. The results were compared to theoretical predictions using the TCFE5 and TCFE6 databases.

Keyword
Duplex Stainless Steel, Phase Equilibrium, Intermetallic Phases, Sigma Phase, Thermo-Calc
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-27708 (URN)10.1002/srin.201000010 (DOI)000278292200002 ()
Note
QC 20101220Available from: 2010-12-20 Created: 2010-12-20 Last updated: 2013-04-29Bibliographically approved
2. On the effect of nickel substitution in duplex stainless steel
Open this publication in new window or tab >>On the effect of nickel substitution in duplex stainless steel
Show others...
2008 (English)In: Materials Science and Technology, ISSN 0267-0836, E-ISSN 1743-2847, Vol. 24, no 3, 348-355 p.Article in journal (Refereed) Published
Abstract [en]

The present experimental and theoretical study investigates the effect of nickel on the phase balance and resulting properties of a 22Cr duplex stainless steel. The decrease in nickel was balanced by nitrogen and manganese additions. It was found that a minimum nickel content was required to maintain mechanical and corrosion properties at technically relevant levels. The influence of increasing nitrogen content on resulting phase composition and properties is discussed.

Keyword
duplex, stainless, steel, nitrogen, low nickel
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-27712 (URN)10.1179/174328408X276116 (DOI)000255903900015 ()
Note
QC 20101220Available from: 2010-12-20 Created: 2010-12-20 Last updated: 2017-12-11Bibliographically approved
3. Microstructure and properties of stainless steel strip welds
Open this publication in new window or tab >>Microstructure and properties of stainless steel strip welds
2008 (English)In: Proceedisngs, Stainless Steel - Science and Market, Helsinki, Finland, 2008Conference paper, Published paper (Refereed)
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-27713 (URN)
Note
QC 20101220Available from: 2010-12-20 Created: 2010-12-20 Last updated: 2013-04-29Bibliographically approved

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Citation style
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