The role of silicon, vacancies, and strain in carbon distribution for low temperature bainite

Sampath, S.; Rementeria, R.; Huang, X.; Caballero, Francesca G.; Janisch, R.; Poplawsky, J. D.; Garcia-Mateo, C.

doi:10.1016/j.jallcom.2016.02.151

Title: The role of silicon, vacancies, and strain in carbon distribution for low temperature bainite

Journal Article · Fri Feb 19 00:00:00 EST 2016 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2016.02.151· OSTI ID:1242670

Sampath, S. ^[1]; Rementeria, R. ^[2]; Huang, X. ^[1]; Caballero, Francesca G. ^[2]; Janisch, R. ^[1]; Poplawsky, J. D. ^[3]; Garcia-Mateo, C. ^[2]

Ruhr Univ. Bochum, Bochum (Germany)
National Center for Metallurgical Research (CENIM-CSIC), Madrid (Spain)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Here, we investigated the phenomenon of carbon supersaturation and carbon clustering in bainitic ferrite with atom probe tomography (APT) and ab-initio density functional theory (DFT) calculations. The experimental results show a homogeneous distribution of silicon in the microstructure, which contains both ferrite and retained austenite. This distribution is mimicked well by the computational approach. In addition, an accumulation of C in certain regions of the bainitic ferrite with C concentrations up to 13 at % is observed. Based on the DFT results, these clusters are explained as strained, tetragonal regions in the ferritic bainite, in which the solution enthalpy of C can reach large, negative values. It seems that Si itself only has a minor influence on this phenomenon.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1242670

Alternate ID(s):: OSTI ID: 1440790

Journal Information:: Journal of Alloys and Compounds, Vol. 673; ISSN 0925-8388

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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