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  The role of Laves phase on microstructure evolution and creep strength of novel 9%Cr heat resistant steels

Prat Borquez, O. S., Garcia, J. L., Rojas Jara, D. E., Sauthoff, G., & Inden, G. (2013). The role of Laves phase on microstructure evolution and creep strength of novel 9%Cr heat resistant steels. Intermetallics, 32, 362-372. doi:10.1016/j.intermet.2012.08.016.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-E300-E Version Permalink: http://hdl.handle.net/21.11116/0000-0001-E301-D
Genre: Journal Article

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 Creators:
Prat Borquez, Orlando Sebastian1, 2, Author              
Garcia, José Luis3, Author              
Rojas Jara, David Eduardo2, 3, Author              
Sauthoff, Gerhard4, Author              
Inden, Gerhard5, Author              
Affiliations:
1Engineering Thermodynamics and Kinetics, Material Diagnostics and Steel Technology, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863362              
2Universidad de Concepción, Departamento de Ingeniería de Materiales, Edmundo Larenas 270, Concepción, Chile, persistent22              
3Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany, persistent22              
4High Temperature Materials, Physical Metallurgy, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863396              
5Phase Equilibria and Transformations, Physical Metallurgy, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863397              

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Free keywords: Competitive growth; Cr alloys; Creep strengths; DICTRA simulation; Equilibrium phase; Form clusters; Heat-resistant steel; Irregular shape; Kinetic modeling; Laves-phase; Low carbon; Martensite laths; Microstructure evolutions; MX carbonitrides; Phase diagram , prediction; Scanning mode; Slow growth; Subgrain boundaries, Austenite; Carbides; Carbon nitride; Chromium alloys; Grain boundaries; Grain growth; Kinetics; Microstructure; Phase diagrams; Transmission electron microscopy, Creep
 Abstract: The influence of Laves phase (type Fe 2W) formation and growth kinetics on the creep strength at 650 °C of two different 9Cr heat resistant steels of the authors' design was investigated. The microstructure evolution was characterized using transmission electron microscopy in the scanning mode (STEM). Kinetic modeling was carried out using the software DICTRA. STEM investigations revealed that the Laves phase precipitates tend to form clusters, have an irregular shape and are often located close to M 23C 6 carbides, along martensite lath boundaries or sub-grain boundaries. DICTRA simulations showed that the growth kinetics of Laves phase was high in the first thousand hours of creep, reaching its equilibrium volume fraction after 7000-10,000 h. Simultaneous competitive growth of M 23C 6 carbides and Laves phase was simulated showing that Laves phase grows very slowly to reach the final equilibrium phase fraction only after almost 13,000 h, while M 23C 6 reached the equilibrium phase fraction already during tempering. Best creep results were obtained for the 9Cr alloy with low carbon content, reduced sub-grain growth, very slow coarsening of MX carbonitrides and slow growth of Laves phase. © 2012 Elsevier Ltd. All rights reserved.

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Language(s): eng - English
 Dates: 2013-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.intermet.2012.08.016
BibTex Citekey: Prat2013362
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Title: Intermetallics
  Abbreviation : Intermetallics
Source Genre: Journal
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Publ. Info: Barking, Essex, England : Elsevier
Pages: - Volume / Issue: 32 Sequence Number: - Start / End Page: 362 - 372 Identifier: ISSN: 0966-9795
CoNE: /journals/resource/954925582175