Investigation on dynamic strain aging behaviour of ferritic-pearlitic ductile cast irons

Kalle Jalava, Jarkko Laine, Joona Vaara, Tero Frondelius, Juhani Orkas

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

The influence of ferritic and pearlitic microstructures to dynamic strain aging (DSA) of ductile iron was investigated by means of strain-controlled cyclic tests performed at temperatures ranging from room temperature to 450°C, strain rates of 10−5 to 10−2 s−1 and at three different strain amplitudes along with tensile tests. Results indicated that all tested microstructures exhibit strain aging effects at elevated temperatures in some form, similar to ferritic-pearlitic steels. Additionally, static tensile tests show hardening at intermediate temperatures, minima in elongation and serrations in stress–strain curves. Cyclic data indicates DSA related changes in stresses at 250°C and 350°C at smaller strain rates, while the effects become more suppressed at higher strain rates. © 2019, © 2019 Institute of Materials, Minerals and Mining.

Original languageEnglish
Pages (from-to)160-167
Number of pages8
JournalMaterials Science and Technology
Volume36
Issue number2
Early online date5 Nov 2019
DOIs
Publication statusPublished - 22 Jan 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Cast iron
  • cyclic testing
  • ductile iron
  • dynamic strain aging
  • elevated temperature
  • ferrite
  • ferritic-pearlitic
  • pearlite

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