Ultrafine spheroidal graphite iron castings

Haruki Itofuji, Kazuya Edane, Tomokatsu Kotani, Masayuki Itamura, Koichi Anzai

Research output: Contribution to journalArticle

Abstract

Gravity die casting of spheroidal graphite iron had been attempted controlling free nitrogen during preparing base molten iron, magnesium treatment, inoculation and pouring. In this study, the actual CO/SiO 2 reaction temperature of base molten irons was surveyed and magnesium treatment was conducted at that temperature. The mold was made of steel and the cavity size was thickness of 5.4 mm and diameter of 35 mm. As the results, ultrafine graphite nodules were obtained without chill in as-cast condition. They were average diameter of 7 µm and density count of over 3,000/mm 2 . Knuckle for automobile was also cast taking the same procedure. Knuckle had no meager defect like shrinkage, chill etc. in as-cast conditions. The possibility of no chill has become extremely higher than former study.

Original languageEnglish
Pages (from-to)41-48
Number of pages8
JournalMaterials Transactions
Volume60
Issue number1
DOIs
Publication statusPublished - 2019 Jan 1

Keywords

  • As-cast
  • Chill free
  • Free nitrogen
  • Gravity die casting
  • Spheroidal graphite iron
  • Ultrafine nodule

ASJC Scopus subject areas

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

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