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High Temperature Tensile Properties and Related Microstructural Evolution in Grade 92 Steel

  • Sultan Alsagabi
  • Somayeh Pasebani
  • Indrajit CharitEmail author
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

Ferritic-martensitic steels with good high temperature mechanical properties have many promising applications in fossil and nuclear power plants. In this work, a F92 steel was tensile tested from room to elevated temperatures (up to 700 °C). This material exhibited higher strength than traditional P92 steels. The reasons for the observed changes in mechanical properties were investigated by studying the microstructural characteristics in undeformed and deformed specimens using transmission electron microscopy. The microstructural evolution accelerated significantly under loading as temperature increased. For instance, the deformed microstructure at 600 °C showed early stages of M23C6 precipitate formation under loading. The M23C6 precipitates exhibited more coarsening tendency whereas the MX-type precipitates retained their size. As coarsening of M23C6 precipitates progressed at elevated temperatures, the strength gradually decreased as the solid solution strengthening deteriorated by removing W and Mo from the solid solution matrix.

Keywords

Ferritic-martensitic steels Grade 92 steel 9Cr–2W steel Tensile testing TEM 

Notes

Acknowledgements

The work was supported by the U.S. Department of Energy, Office of Nuclear Energy under DOE Idaho Operations Office Contract DE-AC07-051D14517, as part of an ATR Nuclear Science User Facility (ATR-NSUF) experiment. Authors would also like to thank Joanna Taylor, Jatu Burns and Dr. Yaqiao Wu at the Center for Advanced Energy Studies (CAES) in Idaho Falls, ID for their help.

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Copyright information

© The Minerals, Metals & Materials Society 2017

Authors and Affiliations

  • Sultan Alsagabi
    • 1
    • 2
  • Somayeh Pasebani
    • 1
    • 3
  • Indrajit Charit
    • 1
    Email author
  1. 1.Chemical and Materials EngineeringUniversity of IdahoMoscowUSA
  2. 2.Atomic Energy Research InstituteKing Abdulaziz City for Science and TechnologyRiyadhSaudi Arabia
  3. 3.School of Mechanical, Industrial and Manufacturing EngineeringOregon State UniversityCorvallisUSA

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