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Ahierarchic modelling approach to phase separation of ferrite in stainless steels
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. (Structure)ORCID iD: 0000-0003-3598-2465
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. (Structure)
2015 (English)In: Stainless Steel: Microstructure, Mechanical Properties and Methods of Application, Nova Science Publishers , 2015, 107-121 p.Chapter in book (Other academic)Text
Abstract [en]

The purpose of this chapter is to present a hierarchic modelling approach to phase separation of ferrite during low temperature aging of stainless steels. This phenomenon is responsible for the so-called 475C embrittlement in ferrite-containing stainless steels and enabling predictive modelling of the underlying phase transformation is of high technical importance, since such steels are vital in e.g., power generation applications. The suggested modelling approach is adopted in a project within the research center Hero-m at KTH in Sweden and currently steps towards predictive modelling of multicomponent alloys are taken. The hierarchic modeling utilizes: first-principles calculations to build fundamental understanding and to evaluate thermodynamic, kinetic and elastic data; CALPHAD-type thermodynamics modelling to build thermodynamic and kinetic databases; and phase-field modelling to simulate the nanostructure evolution. Experimental measurements are also an integrated part of the modelling approach. We demonstrate that the continuum modelling treatments in the literature are insufficient, but also that the suggested approach solving the non-linear Cahn-Hilliard equation, considering initial concentration fluctuations, and using accurate thermodynamic and kinetic input data, provide a viable path.

Place, publisher, year, edition, pages
Nova Science Publishers , 2015. 107-121 p.
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-187396ScopusID: 2-s2.0-84955645306ISBN: 9781634820813OAI: oai:DiVA.org:kth-187396DiVA: diva2:931043
Note

QC 20160526

Available from: 2016-05-26 Created: 2016-05-23 Last updated: 2016-05-26Bibliographically approved

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Odqvist, JoakimHedström, Peter
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