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  Effect of Si on the acceleration of bainite transformation by pre-existing martensite

Toji, Y., Matsuda, H., & Raabe, D. (2016). Effect of Si on the acceleration of bainite transformation by pre-existing martensite. Acta Materialia, 116, 250-262. doi:10.1016/j.actamat.2016.06.044.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-B714-A Version Permalink: http://hdl.handle.net/21.11116/0000-0001-B716-8
Genre: Journal Article

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 Creators:
Toji, Yuki1, Author              
Matsuda, Hiroshi2, Author              
Raabe, Dierk3, Author              
Affiliations:
1Steel Research Laboratory, JFE Steel Corporation, 1 Kawasaki-cho, Chuo-ku, Chiba, Japan, ou_persistent22              
2Steel Research Laboratory, JFE Steel Corporation, 1 Kawasaki-cho, Chuo-ku, Chiba 260-0835, Japan, persistent22              
3Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              

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Free keywords: Austenite; Bainite; Carbon; Manganese; Martensite; Martensitic steel; Probes; Silicon, Atom probe tomography; Bainite transformations; Carbon partitioning; Crystallographic orientations; Martensite transformations; Nishiyama-Wassermann; Orientation relationship; Transformation kinetics, Bainitic transformations
 Abstract: Bainite transformation was investigated focusing on the influence of pre-existing martensite on the transformation kinetics, morphology and crystallographic orientation of subsequently formed bainite using EBSD and atom probe tomography. Two 1.1 wt C-3wt.Mn steels with and without 2 wt Si were used to clarify the effect of Si. Steels were rapidly cooled from 900 °C to 300 °C and held at this temperature, or quenched from 900 °C once in water to generate approximately 30 vol martensite followed by holding at 300 °C. Bainite transformation was clearly accelerated by pre-existing martensite in both Si-containing and Si-free steels. Bainite surrounds the pre-existing martensite in the Si-free steel, whereas it grows to the interior of the austenite grains in the steel containing 2 wt Si. The major orientation relationship between bainite and adjacent austenite was changed by the presence of martensite from Nishiyama-Wassermann (N-W) to Greninger-Troiano (G-T) regardless of Si content. Clear carbon partitioning from martensite into austenite was observed prior to the bainite transformation in the 2 wt Si steel, which was not observed in the Si-free steel. We suggest that the dislocations introduced by the martensite transformation act as a primary factor accelerating the bainite transformation when martensite is introduced prior to the bainite transformation. © 2016 Acta Materialia Inc.

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Language(s): eng - English
 Dates: 2016-09-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1016/j.actamat.2016.06.044
BibTex Citekey: Toji2016250
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Title: Acta Materialia
  Abbreviation : Acta Mater.
Source Genre: Journal
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Publ. Info: Kidlington : Elsevier Science
Pages: - Volume / Issue: 116 Sequence Number: - Start / End Page: 250 - 262 Identifier: ISSN: 1359-6454
CoNE: https://pure.mpg.de/cone/journals/resource/954928603100