Innovative processing of high-strength and low-cost ferritic steels strengthened by Y-Ti-O nanoclusters

Yuren Wen, Yong Liu, Akihiko Hirata, Feng Liu, Takeshi Fujita, Yuhai Dou, Donghua Liu, Bin Liu, Zuming Liu, C. T. Liu

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Nanostructured ferritic alloys (NFAs) have been essentially fabricated by mechanical alloying pre-alloyed ferritic powders with Y 2O 3. In this work, Y 2O 3 was replaced by Y hydride and more soluble Fe 2O 3 to prepare NFAs. The microstructural characterization concerning the formation of nanoparticles and mechanical property of NFAs prepared by the novel process were investigated. It is found, during mechanical alloying both Fe 2O 3 and hydride can be easily dissolved into the ferritic matrix. Coherent Y-Ti-O nanoparticles with a pyrochlore Y 2Ti 2O 7 structure and incoherent Cr-rich oxides were precipitated after the hot consolidation. With an increased milling time, there exists a shift of oxygen from the Cr-rich oxides to Y-Ti-O nanoparticles, resulting in a significantly homogeneous dispersion of nanoparticles. Compared with 14YWT, the NFAs in this work show a combination of high strength and improved ductility. Thus, the addition of Fe 2O 3 as an oxygen carrier provides an alternate way to adjust the oxygen content, which does not require high energy milling; and the combination of hot forging and hot rolling processes, rather than the hot extrusion are more cost-effective.

Original languageEnglish
Pages (from-to)59-69
Number of pages11
JournalMaterials Science and Engineering A
Volume544
DOIs
Publication statusPublished - 2012 May 15
Externally publishedYes

Fingerprint

Nanoclusters
Ferritic steel
high strength
nanoclusters
Mechanical alloying
steels
Nanoparticles
nanoparticles
Oxygen
Processing
Hydrides
Oxides
alloying
hydrides
Costs
oxygen
forging
oxides
Hot rolling
consolidation

Keywords

  • Mechanical alloying
  • ODS ferritic steel
  • Precipitation
  • Transmission electron microscopy (TEM)

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Innovative processing of high-strength and low-cost ferritic steels strengthened by Y-Ti-O nanoclusters. / Wen, Yuren; Liu, Yong; Hirata, Akihiko; Liu, Feng; Fujita, Takeshi; Dou, Yuhai; Liu, Donghua; Liu, Bin; Liu, Zuming; Liu, C. T.

In: Materials Science and Engineering A, Vol. 544, 15.05.2012, p. 59-69.

Research output: Contribution to journalArticle

Wen, Yuren ; Liu, Yong ; Hirata, Akihiko ; Liu, Feng ; Fujita, Takeshi ; Dou, Yuhai ; Liu, Donghua ; Liu, Bin ; Liu, Zuming ; Liu, C. T. / Innovative processing of high-strength and low-cost ferritic steels strengthened by Y-Ti-O nanoclusters. In: Materials Science and Engineering A. 2012 ; Vol. 544. pp. 59-69.
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