Ion-irradiation-induced microstructural modifications in ferritic/martensitic steel T91

Xiang Liu, Yinbin Miao, Meimei Li, Marquis K. Kirk, Stuart A. Maloy, James F. Stubbins

Research output: Contribution to journalArticlepeer-review


In this paper, in situ transmission electron microscopy investigations were carried out to study the microstructural evolution of ferritic/martensitic steel T91 under 1 MeV Krypton ion irradiation up to 4.2 × 1015 ions/cm2 at 573 K, 673 K, and 773 K. At 573 K, grown-in defects are strongly modified by black-dot loops, and dislocation networks together with black-dot loops were observed after irradiation. At 673 K and 773 K, grown-in defects are only partially modified by dislocation loops; isolated loops and dislocation segments were commonly found after irradiation. Post irradiation examination indicates that at 4.2 × 1015 ions/cm2, about 51% of the loops were a0/2〈111〉 type for the 673 K irradiation, and the dominant loop type was a0〈100〉 for the 773 K irradiation. Finally, a dispersed barrier hardening model was employed to estimate the change in yield strength, and the calculated ion data were found to follow the similar trend as the existing neutron data with an offset of 100–150 MPa.

Original languageEnglish (US)
Pages (from-to)305-316
Number of pages12
JournalJournal of Nuclear Materials
StatePublished - Jul 1 2017


  • Dislocation loops
  • Ferritic/martensitic steel
  • In situ ion irradiation
  • Irradiation hardening
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering


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