publication . Article . 2017

Effects of Q&P Processing Conditions on Austenite Carbon Enrichment Studied by In Situ High-Energy X-ray Diffraction Experiments

Allain, Sébastien; Geandier, Guillaume; hell, jean-christophe; soler, michel; Danoix, Fréderic; Gouné, Mohamed;
Open Access English
  • Published: 01 Jan 2017
  • Publisher: HAL CCSD
  • Country: France
Abstract
International audience; We report the first ultra-fast time-resolved quantitative information on the quenching and partitioning process of conventional high-strength steel by an in situ high-energy X-ray diffraction (HEXRD) experiment. The time and temperature evolutions of phase fractions, their carbon content, and internal stresses were determined and discussed for different process parameters. It is shown that the austenite-to-martensite transformation below the martensite start temperature Ms is followed by a stage of fast carbon enrichment in austenite during isothermal holding at both 400 and 450 °C. The analysis proposed supports the concurrent bainite tr...
Subjects
free text keywords: steel, martensite, bainite, Q&P, synchrotron, HEXRD, TRIP, [CHIM.MATE]Chemical Sciences/Material chemistry, [ SPI.MAT ] Engineering Sciences [physics]/Materials, Q&amp, P, Mining engineering. Metallurgy, TN1-997, Thermodynamics, Carbon, chemistry.chemical_element, chemistry, Metallurgy, Microstructure, Materials science, X-ray crystallography, Austenite, Quenching, Isothermal process
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