Ultra Grain Refining and Decomposition of Oxide during Super-heavy Deformation in Oxide Dispersion Ferritic Stainless Steel Powder

Yuuji Kimura, Setsuo Takaki, Shinichi Suejima, Ryuji Uemori, Hiroshi Tamehiro

Research output: Contribution to journalArticle

101 Citations (Scopus)

Abstract

Mechanical milling using a high energy planetary ball mill was applied to the powder mixtures of iron, chromium and yttria (Y2O3) (Fe-24mass%Cr-0-15mass%Y2O3) to introduce a very large strain into the iron-base matrix, and microstructural changes during mechanical milling were investigated in relation to decomposition behavior of Y2O3 particles. Mechanical milling of more than 36 ks was long enough to allow the mechanical alloying of iron and chromium powders. After the milling of 36 ks, ultrafine bec crystalline grains of 10 to 20 nm were formed within Fe-24mass%Cr-15mass%Y2O3 powder mixture and 15 mass% of Y2O3 particles were almost decomposed. The resultant powder mixture markedly hardened to about 1 000 Hv. The decomposition of Y2O3 particles can be explained as being due to the formation of an amorphous grain boundary layer where yttrium and oxygen atoms are enriched. As a result, it is proposed that, for the dissolution of Y2O3, bcc crystalline grains should be refined to a nanometric size to provide a sufficient volume fraction of the grain boundary layer, and that Y2O3 particles should be crushed to several nanometers to produce the driving force for the decomposition of Y2O3 particles.

Original languageEnglish
Pages (from-to)176-182
Number of pages7
JournalISIJ International
Volume39
Issue number1-2
Publication statusPublished - Dec 1 1999

Fingerprint

Stainless Steel
Ferritic steel
Powders
Oxides
Refining
Stainless steel
Decomposition
Iron
Chromium
Boundary layers
Grain boundaries
Crystalline materials
Yttrium
Yttrium oxide
Ball mills
Mechanical alloying
Volume fraction
Dissolution
Oxygen
Atoms

All Science Journal Classification (ASJC) codes

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

Cite this

Ultra Grain Refining and Decomposition of Oxide during Super-heavy Deformation in Oxide Dispersion Ferritic Stainless Steel Powder. / Kimura, Yuuji; Takaki, Setsuo; Suejima, Shinichi; Uemori, Ryuji; Tamehiro, Hiroshi.

In: ISIJ International, Vol. 39, No. 1-2, 01.12.1999, p. 176-182.

Research output: Contribution to journalArticle

Kimura, Yuuji ; Takaki, Setsuo ; Suejima, Shinichi ; Uemori, Ryuji ; Tamehiro, Hiroshi. / Ultra Grain Refining and Decomposition of Oxide during Super-heavy Deformation in Oxide Dispersion Ferritic Stainless Steel Powder. In: ISIJ International. 1999 ; Vol. 39, No. 1-2. pp. 176-182.
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