Please use this identifier to cite or link to this item: doi:10.22028/D291-27816
Title: Investigation of Ta-MX/Z-Phase and Laves Phase as Precipitation Hardening Particles in a 12 Pct Cr Heat-Resistant Steel
Author(s): Sanhueza, J. P.
Rojas, D.
Prat, O.
García, J.
Meléndrez, M. F.
Suarez, S.
Language: English
Title: Metallurgical and Materials Transactions A
Volume: 49
Issue: 7
Pages: 2951-2962
Publisher/Platform: Springer
Year of Publication: 2018
Free key words: TEM characterization
12%Cr steels
Laves Phase
Thermo-Calc Modelling
DDC notations: 620 Engineering and machine engineering
Publikation type: Journal Article
Abstract: A 12%Cr martensitic/ferritic steel was designed and produced to study Laves and Z-phase as precipitation hardening particles under creep conditions at 650ºC. To ensure the precipitation of Laves after tempering, additions of W and Cu were selected according to thermodynamic calculations. It is known that Z-phase formation does not follows the classical nucleation theory. Indeed, MX particles are transformed into Z-phase by Cr diffusion from the matrix to the precipitate. Therefore, to promote fast Z-phase formation, Ta, Co and N additions were used to produce Ta-MX which will be transformed into Z-phase. As main results, Laves precipitation was successfully achieved after tempering with a particle size of 196nm. Concerning Z-phase, the transformation of Ta-MX into Z-phase after tempering was confirmed by the formation of hybrid nanoparticles of 30nm. Although, W and Ta have a low diffusion in martensitic/ferritic matrix, characterization of the precipitates after isothermal aging revealed that Laves and Z-phase have a fast growth kinetic, reaching 400nm and 143nm respectively at 8760h. As consequence, creep test at 650ºC showed prematurely fails after few thousand hours. Therefore, investigations focused on the growth and coarsening behavior of Laves and Z-phase, seem to be the next researcher field of martensitic/ferritic steels.
DOI of the first publication: 10.1007/s11661-018-4654-8
Link to this record: urn:nbn:de:bsz:291--ds-278163
ISSN: 1543-1940
Date of registration: 11-Apr-2019
Sponsorship ID: EU-RISE Project CREATe-Network GA 644013
EU-Projectnumber: info:eu-repo/grantAgreement/EC/H2020/644013/EU//createE-Network
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Materialwissenschaft und Werkstofftechnik
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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