Microstructures and mechanical properties in ultra fine-grained oxide-dispersion ferritic stainless steels

Yuuji Kimura, Shinich Suejima, Hideto Goto, Setsuo Takaki

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Microstructures and mechanical properties were investigated in ultra fine-grained oxide-dispersion steels with 24 mass% Cr ferrite matrix fabricated from mechanical milled powders. Powder mixtures of Fe, Cr and Y 2O 3 were mechanically milled in an argon gas atmosphere and then consolidated at around 1100 K. After 720 ks mechanical milling (MM), nanocrystalline ferrite grain structures were formed within powder particles. As for Y 2O 3 particles, it was observed that they were not only crushed to several nanometers but also decomposed during MM, and then oxides like Y 2O 3 and YCrO 3 finely precipitated in ultra fine grained structure on annealing at around 1200 K. Such ultra fine oxide particles effectively retarded the growth of matrix grains. The sample with 1 vol.% Y 2O 3 addition maintained ultra fine ferrite grains of 0.4 μm even after the annealing of 1573 K-3.6 ks by the Zener pinning effect of the oxide particles of about 10 nm in diameter. Tensile strength of the bulk samples markedly rose as the ferrite grain size became smaller in the grain size range below 1 μm and reached 1.93 GPa for the bulk sample with 1 vol.% Y 2O 3 addition and with the smallest mean grain size of 0.16 μm.

Original languageEnglish
Journalisij international
Volume40
Issue numberSUPPL.
Publication statusPublished - Dec 1 2000

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Stainless Steel
Ferritic steel
Oxides
Ferrite
Stainless steel
Powders
Mechanical properties
Microstructure
Annealing
Argon
Steel
Crystal microstructure
Tensile strength
Gases

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Microstructures and mechanical properties in ultra fine-grained oxide-dispersion ferritic stainless steels. / Kimura, Yuuji; Suejima, Shinich; Goto, Hideto; Takaki, Setsuo.

In: isij international, Vol. 40, No. SUPPL., 01.12.2000.

Research output: Contribution to journalArticle

Kimura, Yuuji ; Suejima, Shinich ; Goto, Hideto ; Takaki, Setsuo. / Microstructures and mechanical properties in ultra fine-grained oxide-dispersion ferritic stainless steels. In: isij international. 2000 ; Vol. 40, No. SUPPL.
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