Synchrotron study on load partitioning between ferrite/martensite and nanoparticles of a 9Cr ODS steel

Kun Mo, Zhangjian Zhou, Yinbin Miao, Di Yun, Hsiao Ming Tung, Guangming Zhang, Weiying Chen, Jonathan Almer, James F. Stubbins

Research output: Contribution to journalArticle

Abstract

Oxide dispersion strengthened (ODS) steels exhibit exceptional radiation resistance and high-temperature creep strength when compared to traditional ferritic and ferritic/martensitic (F/M) steels. Their excellent mechanical properties result from very fine nanoparticles dispersed within the matrix. In this work, we applied a high-energy synchrotron radiation X-ray to study the deformation process of a 9Cr ODS steel. The load partitioning between the ferrite/martensite and the nanoparticles was observed during sample yielding. During plastic deformation, the nanoparticles experienced a dramatic loading process, and the internal stress on the nanoparticles increased to a maximum value of 3.7 GPa, which was much higher than the maximum applied stress (∼986 MPa). After necking, the loading capacity of the nanoparticles was significantly decreased due to a debonding of the particles from the matrix, as indicated by a decline in lattice strain/internal stress. Due to the load partitioning, the ferrite/martensite slightly relaxed during early yielding, and slowly strained until failure. This study develops a better understanding of loading behavior for various phases in the ODS F/M steel.

Original languageEnglish (US)
Pages (from-to)376-381
Number of pages6
JournalJournal of Nuclear Materials
Volume455
Issue number1-3
DOIs
StatePublished - Dec 2014

ASJC Scopus subject areas

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

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