Evolution of the substructure of a novel 12% Cr steel under creep conditions

Surya Deo Yadav, Szilvia Kalácska, Mária Dománková, David Canelo Yubero, Roland Resel, I. Groma, Coline Beal, Bernhard Sonderegger, Christof Sommitsch, Cecilia Poletti

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

In this work we study the microstruture evolution of a newly developed 12% Cr martensitic/ferritic steel in as-received condition and after creep at 650 °C under 130 MPa and 80 MPa. The microstructure is described as consisting of mobile dislocations, dipole dislocations, boundary dislocations, precipitates, lath boundaries, block boundaries, packet boundaries and prior austenitic grain boundaries. The material is characterized employing light optical microscopy (LOM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and electron backscatter diffraction (EBSD). TEM is used to characterize the dislocations (mobile + dipole) inside the subgrains and XRD measurements are used to the characterize mobile dislocations. Based on the subgrain boundary misorientations obtained from EBSD measurements, the boundary dislocation density is estimated. The total dislocation density is estimated for the as-received and crept conditions adding the mobile, boundary and dipole dislocation densities. Additionally, the subgrain size is estimated from the EBSD measurements. In this publication we propose the use of three characterization techniques TEM, XRD and EBSD as necessary to characterize all type of dislocations and quantify the total dislocation densty in martensitic/ferritic steels.

Original languageEnglish
Pages (from-to)23-31
Number of pages9
JournalMaterials Characterization
Volume115
DOIs
Publication statusPublished - May 1 2016

Keywords

  • Creep
  • Dislocations
  • EBSD
  • Rietveld refinement
  • TEM
  • XRD

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)
  • Condensed Matter Physics

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  • Cite this

    Yadav, S. D., Kalácska, S., Dománková, M., Yubero, D. C., Resel, R., Groma, I., Beal, C., Sonderegger, B., Sommitsch, C., & Poletti, C. (2016). Evolution of the substructure of a novel 12% Cr steel under creep conditions. Materials Characterization, 115, 23-31. https://doi.org/10.1016/j.matchar.2016.03.015