Observatorio de I+D+i UPM

Memorias de investigación
Communications at congresses:
Integrated Landau Modeling of Microstructural and Energetic Natures of A/M Transformation in Polycrystalline Q&P Steels
Year:2014
Research Areas
  • Chemical phisycs of materials,
  • Computer chemistry,
  • Kinetic,
  • Thermodynamics,
  • Physics - Structure of materials,
  • Structural phase transition
Information
Abstract
The Q&P (Quenching & Partitioning) process, undergoing a partial austenite-to-martensite (A/M) transformation under quenching followed by annealing-promoted carbon partitioning, opens up a new way to develop steel microstructures with exceptionally advantageous combination of A/M phases at the industrial scale. Coupling the Ginzburg-Landau theory seamlessly with computational thermodynamics/kinetics, we develop an integrated Landau model at mesoscale that enables, for the first time, the intricate A/M microstructure interplayed by the diffusive-displacive transformations to be described in polycrystalline steels while correctly grasps the underdamped nature of the energetic convergence for the phonon vibration of system. We illustrate the modeling by representing the spatiotemporal distribution of carbon and motion of A/M interfaces observed in new Q&P steels, as a consequence, demonstrating it is the coupling between elasticity and diffusion that concurrently governs partitioning. To conclude, the integrated Landau model acquires realistic driving force of the Q&P process from its coupled thermo-kinetic database and real materials parameters and validation from such experimental techniques as nanoindentation, laser confocal in-situ metallography and electron back-scattered diffraction etc, thereby finding its applications in microstructure controlling and design in Q&P productions.
International
Si
Congress
Materials Science and Engineering 2014- Young Researchers meet Professionals
960
Place
Darmstadt Germany
Reviewers
Si
ISBN/ISSN
n/a
n/a
Start Date
23/09/2014
End Date
25/09/2014
From page
49
To page
49
10
Participants
  • Autor: Guanglong Xu (UPM)
  • Autor: Dong-Wook Lee
  • Autor: Yi Chen (UPM)
  • Autor: Yuwen Cui
  • Autor: Fco. Javier Llorca Martinez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Departamento: Ciencia de Materiales
S2i 2019 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)