Disappearance of martensitic strengthened-micro-texture in modified 9Cr-1Mo steel caused by stress-induced acceleration of atomic diffusion at elevated temperatures

Taichi Shinozaki, Ken Suzuki, Hideo Miura

研究成果: Conference contribution

3 被引用数 (Scopus)

抄録

Modified 9Cr-1Mo steel is a heat-resistant steel developed for a steam generator in FBR (Fast Breeder Reactor) and it has been applied to various thermal power plants. Recently, it was found that the fatigue limit of this steel did not appear up to 108 cycles at temperatures higher than 500ºC. The reason for the disappearance of the fatigue limit was attributed to the change of the initially designed microstructure of the alloy. The initially dispersed fine lath martensitic texture disappeared at temperatures higher than 500oC, when the amplitude of the applied stress exceeded a certain critical value. In order to explicate the dominant factors of this change quantitatively, the change of the microstructure and the strength of the alloy were continuously observed by applying an intermittent fatigue and creep tests at elevated temperatures and EBSD analysis. It was found that there was a critical stress which caused the microstructure change at each test temperature higher than 500oC, and the activation energy of the change was determined as a function of temperature and the applied tensile stress. The dominant factor of the micro structure change was the stress-induced acceleration of the atomic diffusion of the component element of the alloy.

本文言語English
ホスト出版物のタイトルAdvances in Fracture and Damage Mechanics XVII
編集者Luis Rodriguez-Tembleque, Jaime Dominguez, Ferri M.H. Aliabadi
出版社Trans Tech Publications Ltd
ページ31-35
ページ数5
ISBN(印刷版)9783035713503
DOI
出版ステータスPublished - 2018
イベント17th International Conference on Fracture and Damage Mechanics, FDM 2018 - Bangkok, Thailand
継続期間: 2018 9 42018 9 6

出版物シリーズ

名前Key Engineering Materials
774 KEM
ISSN(印刷版)1013-9826
ISSN(電子版)1662-9795

Other

Other17th International Conference on Fracture and Damage Mechanics, FDM 2018
国/地域Thailand
CityBangkok
Period18/9/418/9/6

ASJC Scopus subject areas

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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