Thermal stability of microstructure in grain boundary character distribution-optimized and cold-worked austenitic stainless steel developed for nuclear reactor application

Shinichiro Yamashita, Yasuhide Yano, Ryusuke Tanikawa, Norihito Sakaguchi, Seiichi Watanabe, Masanori Miyagi, Shinya Sato, Hiroyuki Kokawa

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

Abstract

Grain boundary character distribution-optimized (GBCD) Type 316 corresponding austenitic stainless steel and its cold-worked form (GBCD+CW) are prospective materials to be considered for next generation nuclear energy systems. Specimens of these steels were thermally-aged at 973 K for 1 and 100 h and then examined by transmission electron microscopy (TEM) to evaluate microstructural stability during heat treatment high temperature. TEM results revealed that microstructures of both specimens types prior to ageing contained step-wise boundaries which were composed of coincidence site lattice (CSL) boundaries. The GBCD+CW specimens had dislocation cells and networks as well as deformation twins whereas the GBCD one possessed few dislocations. After thermal ageing, the precipitates were formed on not only random grain boundaries but also on dislocations, and they contribute to prevent significant microstructural change such as recrystallization and dislocation recovery.

Original languageEnglish
Title of host publicationMaterials Research Needs to Advance Nuclear Energy
Pages121-126
Number of pages6
Publication statusPublished - 2010 Nov 29
Event2009 MRS Fall Meeting - Boston, MA, United States
Duration: 2009 Nov 302009 Dec 4

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1215
ISSN (Print)0272-9172

Other

Other2009 MRS Fall Meeting
CountryUnited States
CityBoston, MA
Period09/11/3009/12/4

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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