Consolidation of sheathed pure iron powders by warm caliber rolling

M. Otaguchi, S. Wanikawa, K. Tsuzaki, K. Nagai

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Metal powders produced by mechanical milling show the specific microstructures and properties. With these merits preserved, the powders should be combined into a large size compact. Saito et al. and Kimura et al. have succeeded in consolidating the iron powders into 1 ∼ 2.5 mm thick sheets by sheath rolling at a relatively low temperature of 973K. Based upon their success, we have attempted to apply caliber rolling for consolidating the powders into a large bar (φ11 × 1000 mm). The sheath can was filled with pure iron powders, sealed in vacuum, and then rolled. When the rolling temperature was 973K, rolling reduction of more than 80% was enough to make sound compacts of >10 mm diameter with fine microstructure and relative density larger than 99.6%. When the rolling reduction was 90%, the consolidation was accomplished in a wide range of rolling temperature between 1273K and 823K. At 823K and 873K, the sound consolidation could be realized without recrystallization. The tensile propertie s were better than those of the HIP treated compact. Hence, the solid-state joining is confirmed to occur much easier in the present method than in the HIP method.

Original languageEnglish
Pages (from-to)480-485
Number of pages6
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume87
Issue number7
DOIs
Publication statusPublished - Jul 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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