Investigation of pre-existing pores in creep loaded 9Cr steel

Surya Deo Yadav, Joerdis Rosc, Bernhard Sartory, Roland Brunner, Bernhard Sonderegger, Christof Sommitsch, Maria Cecilia Poletti

Research output: Chapter in Book/Report/Conference proceedingConference paperpeer-review


Creep failure of materials under service conditions strongly rely on the formation and growth of cavities, encouraging the characterization and modelling of the cavitation process. In the present work pre-existing pores from manufacturing process are investigated in 9Cr steel creep loaded for up to 9000 hours. Scanning electron microscopy (SEM) is used for 2D analysis while Computer tomography (CT) is employed for 3D exploration. Nearest neighbours distances in 3D are calculated from 2D measurements and are decreasing with creep exposure time. The pore growth is studied applying a physical growth model, and experimental results are compared with numerical simulation. From this research it is deduced that damage occurs by agglomeration and growth of pre-existing cavities. The developed model can predict the growth of pores as a function of temperature and load at service.

Original languageEnglish
Title of host publication3DMS 2014 - Proceedings of the 2nd International Congress on 3D Materials Science
Place of PublicationHoboken, NJ, USA
PublisherJohn Wiley & Sons, Inc
Number of pages6
ISBN (Print)9781118945452
Publication statusPublished - 2014
Event2nd International Congress on 3D Materials Science, 3DMS 2014 - Annecy, France
Duration: 29 Jun 20142 Jul 2014


Conference2nd International Congress on 3D Materials Science, 3DMS 2014


  • Cavity growth
  • Computed tomography
  • Martensitic steel
  • Modelling
  • P91

ASJC Scopus subject areas

  • Mechanics of Materials
  • Materials Science(all)

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