Production of Fe–C Amorphous Powders by a Two-Stage Quenching Technique

Akihisa Inoue, Junji Saida, Tsuyoshi Masumoto

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

In order to clarify the cooling capacity of the two-stage quenching technique by a combination of high-pressure argon gas atomization and centrifugal spinning, the morphology and structure of Fe85.6C14.4 and Fe82.6C17.4 powedrs produced by the technique were examined as a function of particle size fraction. The powder particle morphology is mainly spherical for small particles below 25 μm in diameter and flaky (with a thickness of about 1 to 4 μm) for particles with sizes above about 44 μm. The as-quenched structure consists of α′+Fe3C+γ phases for the spherical powders and an amorphous phase for the flaky powders. The formation of the amorphous phase is different from the result of the melt-spun ribbons in which α′+Fe3C+γ phases are formed. It is therefore concluded that the two-stage quenching technique leading to the formation of flaky powders has an enhanced cooling rate because of a reduced thickness and a large contact surface of the flaky powders obtained by the spinning of super-cooled liquid droplets formed during gas atomization.

Original languageEnglish
Pages (from-to)291-299
Number of pages9
JournalMaterials Transactions, JIM
Volume30
Issue number4
DOIs
Publication statusPublished - 1989 Jan 1

Keywords

  • amorphous phase
  • centrifugal spinning
  • flaky powder
  • high-pressure gas atomization
  • iron-carbon alloy
  • supercooled liquid
  • two-stage quenching

ASJC Scopus subject areas

  • Engineering(all)

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