Elevated temperature thermal conductivities of some as-cast and austempered cast irons

Kalle Jalava, Kaisu Soivio, Jarkko Laine, Juhani Orkas

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

The aim of this study was to provide insight on thermal conductivity of three cast iron groups, namely lamellar, compacted and spheroidal graphite irons at elevated temperatures up to 673 K (400°C) in as-cast and austempered states. Austempering treatments increased mechanical properties of all the studied materials while decreasing thermal conductivity across the line. The effects of austempering on conductivity were lower for grey and compacted graphite iron than for spheroidal graphite irons. The results indicate that heat treating can be a viable option in increasing cast iron performance in thermally stressed applications. One ferritic low-silicon spheroidal graphite iron surpassed lamellar graphite iron in conductivity at elevated temperatures, while high-silicon spheroidal graphite irons exhibited low conductivities.
Original languageEnglish
Pages (from-to)327-333
Number of pages7
JournalMaterials Science and Technology
Volume34
Issue number3
Early online date20 Oct 2017
DOIs
Publication statusPublished - 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • Cast iron
  • thermal conductivity
  • spheroidal graphite
  • compacted graphite
  • lamellar graphite
  • elevated temperature
  • austempering

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