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Partial Equilibrium Prediction of Solidification and Carbide Precipitation in Ti-added High Cr Cast Irons
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
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2014 (English)In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 54, no 2, 374-383 p.Article in journal (Refereed) Published
Abstract [en]

Carbide precipitation and eutectic phase transformation during solidification of Fe-C-Cr-Ti-Mn-Mo-Ni-Si Ti-added high-chromium cast irons (HCCIs) were studied numerically and experimentally by the help of Partial Equilibrium approximation, DSC thermal analyses and EDX analyses. The main carbides formed during the solidification are distinguished as MC, primary M7C3 and eutectic M7C3 from their distinguished constitution, while other researchers didn't distinguish the primary and eutectic M7C3 carbide. Through comparing the prediction of Partial Equilibrium approximation with DSC thermal analysis measurement, the precipitation sequence of the eutectic structure in HCCIs is clarified to follow the sequence of FCC prior to the eutectic M7C3, although they were usually expected to precipitate simultaneously. The hardness index of the HCCIs is evaluated quantatively by summation of the contributions of the Vickers hardness of MC, primary M7C3 and eutectic M7C3 carbides with predicted precipitation amount and composition / constitution. The effects of C, Ti and Cr contents on the precipitation sequence, the amount and the composition of carbides as well as the hardness of the HCCIs are discussed deeply. Finally, the validity of Partial Equilibrium approximation is shown in prediction of the solidification in multicomponent system with large amount of precipitated carbides.

Place, publisher, year, edition, pages
2014. Vol. 54, no 2, 374-383 p.
Keyword [en]
high chromium cast irons, solidification path, carbide precipitation, hardness index, Partial Equilibrium approximation
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-144132DOI: 10.2355/isijinternational.54.374ISI: 000332682800019Scopus ID: 2-s2.0-84897045181OAI: oai:DiVA.org:kth-144132DiVA: diva2:712114
Note

QC 20140414

Available from: 2014-04-14 Created: 2014-04-10 Last updated: 2017-12-05Bibliographically approved

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