Microstructure refinement in martensitic creep resistant steel via severe plastic deformation

Petr Kral, Jiri Dvorak, Vaclav Sklenicka, Yoichi Takizawaa, Takahiro Masuda, Zenji Horita, Kveta Kucharova, Marie Kvapilova, Marie Svobodova

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this study, the effect of severe plastic deformation on grain size refinement and mechanical properties of a coarse-grained steel was investigated. The experimental material used in the present investigation was advanced tungsten modified 9 %Cr P92 steel. The coarse-grained state of P92 steel was deformed at room temperature by high-pressure sliding or high-pressure torsion. The microstructure was investigated using Tescan Lyra 3 scanning electron microscope equipped with an electron-back scatter unit. Severe plastic deformation at room temperature led to grain size reduction down to sub-microscopic level. The grain size and hardness exhibited significant changes to the equivalent strain of about 10, and slight changes between the equivalent strains of 10-20. Equivalent plastic strains higher than 20 only led to insignificant changes in the mean grain size and hardness. The creep behaviour of the ultrafine-grained state exhibited the minimum creep rate of about two orders of magnitude greater when compared to the coarse-grained P92 steel.

Original languageEnglish
Title of host publicationNANOCON 2018 - Conference Proceedings, 10th Anniversary International Conference on Nanomaterials - Research and Application
PublisherTANGER Ltd.
Pages597-602
Number of pages6
ISBN (Electronic)9788087294895
Publication statusPublished - 2019
Event10th Anniversary International Conference on Nanomaterials - Research and Application, NANOCON 2018 - Brno, Czech Republic
Duration: Oct 17 2018Oct 19 2018

Publication series

NameNANOCON 2018 - Conference Proceedings, 10th Anniversary International Conference on Nanomaterials - Research and Application

Conference

Conference10th Anniversary International Conference on Nanomaterials - Research and Application, NANOCON 2018
CountryCzech Republic
CityBrno
Period10/17/1810/19/18

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Electrical and Electronic Engineering
  • Ceramics and Composites
  • Electronic, Optical and Magnetic Materials

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