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Title: Quantitative assessment of carbon allocation anomalies in low temperature bainite

Journal Article · · Acta Materialia
 [1];  [1];  [2];  [2];  [3];  [3];  [4];  [1];  [1]
  1. Spanish National Center for Metallurgical Research (CENIM-CSIC), Madrid (Spain)
  2. Univ. de Lorraine, Nancy Cedex (France)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. Complutense de Madrid, Madrid (Spain)

Low temperature bainite is a mixture of ferrite and austenite with a high dislocation density and nanoscale precipitates produced by isothermal transformation of the austenite in high-carbon high-silicon steels. The mass balance for carbon is systematically unsuitable when considering only ferrite and austenite forming the structure, but no attempt has been made to evaluate the amount of carbon located at linear defects and precipitates. Additionally, bainitic ferrite has been recently shown to have a tetragonal crystal structure, allowing greater amounts of carbon in solid solution than those expected by the paraequilibrium phase boundaries. In order to quantify the contribution of all the carbon sinks, we have followed the evolution of carbon in ferrite and austenite, along with the precipitation of cementite and η–carbide, during the isothermal bainitic transformation at 220 and 250 °C by means of in-situ synchrotron high energy X-ray diffraction and complementary transmission electron microscopy (TEM) and atom probe tomography (APT) analyses. Furthermore, this is the first time that the mass balance for carbon is successfully achieved by considering all the transformation products together with an estimation of the carbon segregated to linear defects.

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:
1361375
Alternate ID(s):
OSTI ID: 1439490
Journal Information:
Acta Materialia, Vol. 133, Issue C; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 43 works
Citation information provided by
Web of Science

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Cited By (5)

Quantitative Assessment of the Time to End Bainitic Transformation journal August 2019
Cryogenic study of the magnetic and thermal stability of retained austenite in nanostructured bainite journal June 2019
Quantitative Assessment of the Time to End Bainitic Transformation text January 2019
In Situ Investigation of the Iron Carbide Precipitation Process in a Fe-C-Mn-Si Q&P Steel text January 2018
Effects of Q&P Processing Conditions on Austenite Carbon Enrichment Studied by In Situ High-Energy X-ray Diffraction Experiments journal June 2017