Relationship between creep behavior and microstructure in martensitic heat resistant steel

Kengo Iwanaga, Toshihiro Tsuchiyma, Setsuo Takaki

Research output: Contribution to journalArticle

Abstract

Relationship between creep deformation behavior and microstructural change has been investigated in a 12%Cr-0.12%C steel by means of optical and transmission electron microscopy. Applied stress assists the recovery of martensite at high temperature: Dislocation density is markedly decreased and Ostwald growth of M 23C 6 type carbide is promoted. Creep deformation behavior strongly depends on these microstructural changes in lath martensitic structure.In the early stage of creep test, M 23C 6 type carbide particles precipitate along lath boundary and form rod-like carbide. Such a carbide effectively suppresses the movement of dislocations and contributes to the holding of creep strength. But once the rod-like carbide is separated through Ostwald growth of carbide particles during creep deformation, dislocations become easy to move and the recovery of martensite proceeds rapidly. This leads to an acceleration of the creep deformation.

Original languageEnglish
Pages (from-to)60-65
Number of pages6
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume84
Issue number12
Publication statusPublished - Dec 1 1998

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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