Microstructure Control of Fe-25mass%Cr-(1.5-1.8)mass%C Alloys by Mechanical Alloying

Yuuji Kimura, Setsuo Takaki, Hideto Goto

Research output: Contribution to journalArticle

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Abstract

Microstructures and mechanical properties were investigated for Fe-25mass%Cr-(1.5-1.8)mass%C alloys produced by mechanical alloying. Mixtures of iron , chromium and graphite powders were ball-milled in Ar atmosphere and then hot-pressed at 1273K in vacuum. Bulk materials obtained were subjected to annealing in temperature range of 873K-1473K, followed by air-cooling or water quenching. In Fe-25mass%Cr-(1.5-1.8)mass%C powder mixtures, nano-sized ferrite(αFe) grains are formed within powder particles after the ball-milling of 720ks. In powder with 720ks milling, M23C6 carbide finely precipitates during heating to the consolidation temperature, and this results in the formation of microduplex structure of (αFe+M23C6). Microstructure of the alloys are very sensitive to heat treatment conditions: Matrix is almost fully austenitic in annealing at around 1473K, while is martensitic in annealing at around 1273K. In the martensite structure formed in fine austenite grains of 1-2μm, it is characteristic that each prior austenite grain consists of only one set of laths with the same variant. The bending strength of MA bulk materials is much higher than that of materials produced by ingot-metallurgy process due to having the microduplex structures.

Original languageEnglish
Pages (from-to)283-288
Number of pages6
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume45
Issue number3
DOIs
Publication statusPublished - Jan 1 1998

Fingerprint

Mechanical alloying
Powders
Ferrite
Microstructure
Annealing
Austenite
Graphite
Milling (machining)
Ball milling
Chromium
Metallurgy
Ingots
Martensite
Bending strength
Consolidation
Carbides
Precipitates
Quenching
Iron
Heat treatment

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Microstructure Control of Fe-25mass%Cr-(1.5-1.8)mass%C Alloys by Mechanical Alloying. / Kimura, Yuuji; Takaki, Setsuo; Goto, Hideto.

In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, Vol. 45, No. 3, 01.01.1998, p. 283-288.

Research output: Contribution to journalArticle

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