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Experimental and theoretical investigation of precipitate coarsening rate in Z-phase strengthened steels
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0003-3598-2465
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2018 (English)In: Materialia, ISSN 2589-1529, Vol. 4, p. 247-254Article in journal (Refereed) Published
Abstract [en]

Two Z-phase strengthened 12% Cr steels were investigated: they are similar in composition, however one steel contains Nb and the other contains Ta. Z-phase precipitates (CrMN, M = Nb or Ta) provide precipitation hardening for creep resistance at 650 °C in these steels. Experimental data based on the transmission electron microscopy investigation of the size evolution of Z-phase precipitates during isothermal ageing at 650 °C show that the Ta-based Z-phase benefits from a five times smaller coarsening constant compared to the Nb-based Z-phase. Theoretical calculations show that this is attributed to the smaller diffusivity of Ta compared to Nb in the steel matrix. Besides, comparing the size of the Ta-based Z-phase precipitates in the gauge and head portion of a crept specimen, it is shown that Z-phase coarsens faster under stress.

Place, publisher, year, edition, pages
Elsevier B.V. , 2018. Vol. 4, p. 247-254
Keywords [en]
Coarsening rate, Creep, Diffusivity, Electron microscopy, Precipitate
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-247006DOI: 10.1016/j.mtla.2018.09.024Scopus ID: 2-s2.0-85060881350OAI: oai:DiVA.org:kth-247006DiVA, id: diva2:1330941
Note

QC 20190626

Available from: 2019-06-26 Created: 2019-06-26 Last updated: 2019-06-26Bibliographically approved

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Odqvist, Joakim

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