Application of a physically-based dislocation creep model to P92 for constructing TTR diagrams

Florian Kerem Riedlsperger*, Gerold Zuderstorfer, Bernhard Krenmayr, Bernhard Sonderegger

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


To raise the efficiency of thermal power plants, operation temperature and pressure must be increased by improving the creep performance of materials such as martensitic Cr-steels. To understand the underlying mechanisms of degradation, physical creep modelling provides a detailed and profound insight into microstructural processes. For such a physically based dislocation creep model, it is demonstrated that based on a parameter set found for one experimental creep curve, numerous creep curves on different stress levels can be simulated without any additional experimental data. These simulation results are then used for constructing a TTR diagram of P92. We succeeded in extrapolating rupture times for variations in both applied stress and temperature. In all cases, microstructural evolution of the simulated material is considered, including dislocation density, subgrain size and precipitates. The obtained rupture times in the simulated TTR diagram are compared to reference data, achieving good agreement.
Original languageEnglish
Pages (from-to)161-166
Number of pages6
JournalMaterials at High Temperatures
Issue number2
Publication statusPublished - 12 Feb 2022


  • creep modelling
  • precipitation kinetics
  • dislocation density
  • time-to-rupture diagrams
  • precipitate kinetic simulations
  • Creep modelling

ASJC Scopus subject areas

  • Metals and Alloys
  • Condensed Matter Physics
  • Mechanics of Materials
  • Ceramics and Composites
  • Mechanical Engineering
  • Materials Chemistry


Dive into the research topics of 'Application of a physically-based dislocation creep model to P92 for constructing TTR diagrams'. Together they form a unique fingerprint.

Cite this