Evaluation of yield strength taking account of particle size-distribution in particle dispersion strengthened ferritic steel

Translated title of the contribution: Evaluation of yield strength taking account of particle size-distribution in particle dispersion strengthened ferritic steel

Tomoyuki Kitaura, Hideyuki Hidaka, Toshihiro Tsuchiyama, Setsuo Takaki

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Yield strength of particle dispersion strengthened ferritic steel is discussed in consideration of the size-distribution of particles in some imaginary models with different type of size-distribution and real materials of an Fe-C alloy and Fe-oxide alloys. Estimation of the mean particle spacing (λ) using the models has revealed that λ strongly depends on the type of size-distribution: ideal distribution, nominal distribution and log-nominal distribution, and that the influence of size-distribution on λ becomes more significant with increasing size and volume fraction of particles. This means that the size-distribution has to be considered for the correct estimation of the increment in yield strength (Δσ) depending on particle dispersion strengthening, especially in high strengthened materials. The Δσ measured for the real materials was found to be proportional to λ-1 regardless of the kind of particles by making an appropriate correction of the size-distribution of particles. Consequently, the increment of yield strength due to particle dispersion strengthening was described as Δσ[MPa]=64/λ [μm] in the iron-base ferritic alloys.

Original languageJapanese
Pages (from-to)796-802
Number of pages7
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume91
Issue number11
DOIs
Publication statusPublished - Nov 2005

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All Science Journal Classification (ASJC) codes

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

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