Materials pp 141-148 | Cite as

Deformation Structures in High-Cycle Fatigue of 0.1N-32Mn-7Cr Steel at Cryogenic Temperatures

  • Osamu Umezawa
  • Keisuke Ishikawa
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 38)


Nitrogen-strengthened 32Mn-7Cr austenitic steel was cyclically deformed at various maximum stress amplitudes. The deformation structures induced by fatigue at cryogenic temperatures were examined by transmission electron microscopy. The dominant deformation mode was the {111}–<110> slip system, and dislocation motion was planar, especially at low stress levels. Cross slip of dislocations was strongly suppressed, and dislocation movements were restricted to their slip planes. At higher stress levels, mainly slip bands were observed. At lower stress levels, microslip or dislocation pile-ups were blocked or sharply localized at grain boundaries. Deformation twinning and E-martensite are not presumed to play a major role in the cyclic deformation.


Slip System Slip Band Deformation Structure Cryogenic Temperature Deformation Twinning 
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Copyright information

© Springer Science+Business Media New York 1992

Authors and Affiliations

  • Osamu Umezawa
    • 1
  • Keisuke Ishikawa
    • 1
  1. 1.National Research Institute for MetalsTsukuba, Ibaraki 305Japan

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