Carbon heterogeneities in austenite during Quenching & Partitioning (Q&P) process revealed by in situ High Energy X-Ray Diffraction (HEXRD) experiments

SCRIPTA MATERIALIA

卷:181

Article

Allain, Sebastien Y. P.¹  Gaudez, Steve¹  Geandier, Guillaume¹  Danoix, Frederic²  Soler, Michel³  Goune, Mohamed⁴ 

[1] UMR CNRS Univ Lorraine 7198, Inst Jean Lamour, F-54000 Nancy, France

[2] Normandie Univ, Grp Phys Mat, CNRS, INSA Rouen,UNIROUEN, F-76000 Rouen, France

[3] ArcelorMittal Maizieres Res SA, ArcelorMittal Maizieres Prod, F-57283 Maizieres Les Metz, France

[4] Inst Chim Matiere Condensee Bordeaux, UPR CNRS 9048, F-33608 Pessac, France

关键词: Steel;    Martensite;    Austenite;    Partitioning;    X-ray diffraction;   

DOI  :  10.1016/j.scriptamat.2020.02.022

来源: Elsevier

【 摘 要 】

Based on the evolution of the positions and intensities of the diffraction peaks, high energy X-ray diffraction (HEXRD) is recognized as the ultimate method to follow quantitatively in situ phase transformations in steels. However, the possible asymmetricity of diffraction peaks is seldom considered, and is known to bear information. A procedure for quantifying their skewness is proposed. In the case of a third generation high strength steel obtained by quench and partitioning (Q&P), the skewness is shown to be due to carbon heterogeneities at austenite/martensite interfaces developed at nanoscale, in agreement with prior post mortem atom probe tomography (APT) investigations. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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