Modeling and Simulation of Pore Formation in a Bainitic Steel During Creep View Full Text


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Article Info

DATE

2022-01-07

AUTHORS

Felix Meixner, Mohammad Reza Ahmadi, Christof Sommitsch

ABSTRACT

In the field of power engineering, where materials are subjected to high pressures at elevated temperatures for many decades, creep-resistant steels are put to work. Their service life is still, however, finite, as the many changes in their microstructure can merely be mitigated and not avoided. Creep cavitation is one of those changes and, in many cases, ultimately causes failure by rupture. In this work, a model is proposed to simulate the nucleation and growth of cavities during creep. This exclusively physics-based model uses modified forms of Classical Nucleation Theory and the Onsager Extremum Principle in a newly developed Kampmann–Wagner framework. The model is validated on P23 steel which underwent creep rupture experiments at 600 °C and stresses of 50, 70, 80, 90 and 100 MPa for creep times up to 46000 hours. The model predicts qualitatively the shape and prevalence of cavities at different sites in the microstructure, and quantitatively the number density, size of cavities and their phase fraction contributing to a reduction in density. Finally, we find good agreement between the simulation and the experimental results especially at low stresses and longer creep times. More... »

PAGES

984-999

References to SciGraph publications

  • 2018-07-17. Modelling the formation and self-healing of creep damage in iron-based alloys in JOURNAL OF MATERIALS SCIENCE
  • 1974-06. Cavitation in creep in JOURNAL OF MATERIALS SCIENCE
  • 1997-08. Void Nucleation in Passivated Interconnect Lines: Effects of Site Geometries, Interfaces, and Interface Flaws in JOURNAL OF MATERIALS RESEARCH
  • 2009-01-21. Generalized Nearest-Neighbor Broken-Bond Analysis of Randomly Oriented Coherent Interfaces in Multicomponent Fcc and Bcc Structures in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2016-01-05. Prospects for Martensitic 12 % Cr Steels for Advanced Steam Power Plants in TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
  • 1997-08. Void Nucleation on a Contaminated Patch in JOURNAL OF MATERIALS RESEARCH
  • 2016-07-26. Autonomous Filling of Grain-Boundary Cavities during Creep Loading in Fe-Mo Alloys in METALLURGICAL AND MATERIALS TRANSACTIONS A
  • 2015-10-06. Thermal surface free energy and stress of iron in SCIENTIFIC REPORTS
  • 2001-02. Materials for ultrasupercritical coal power plants—Boiler materials: Part 1 in JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
  • 1987. Fracture at High Temperatures in NONE
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s11661-021-06569-y

    DOI

    http://dx.doi.org/10.1007/s11661-021-06569-y

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1144501750


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