Austempering experiments of production grade silicon solution strengthened ductile iron

Kaisu Soivio*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

Austempered ductile iron provides a feasible way to produce high strength components. However, in heat treatments resulting in highest strengths some of the ductility is lost due to formation of bainitic carbides. The role of silicon in inhibiting the formation of iron carbides in ascast ductile irons as well as its solution strengthening effect is well known and acknowledged in industry. The effect of silicon on austemperability, resulting microstructures, and mechanical properties of austempered ductile irons with silicon contents with 3.4-3.8 w-% was researched. Quenching and austempering heat treatments were carried out for production grade silicon solution strengthened ductile irons EN GJS 500-14. Results indicate, that it is possible to manufacture a fully ausferritic structure into a silicon solution strengthened matrix and indeed good ductility can be achieved in combination with ultimate tensile strength of 1600 MPa. Segregation of silicon reduces the solubility of carbon into the matrix especially close to the graphite nodules which reduce the stability of carbon stabilized austenite and leads into compromised machinability.

Original languageEnglish
Title of host publicationScience and Processing of Cast Iron XI
PublisherTRANS TECH PUBLICATIONS
Pages239-245
Number of pages7
ISBN (Print)9783035710557
DOIs
Publication statusPublished - 1 Jan 2018
MoE publication typeA4 Article in a conference publication
EventInternational Symposium on the Science and Processing of Cast Iron - Jonkoping, Sweden
Duration: 4 Sep 20177 Sep 2017
Conference number: 11

Publication series

NameMaterials Science Forum
Volume925 MSF
ISSN (Print)0255-5476

Conference

ConferenceInternational Symposium on the Science and Processing of Cast Iron
Abbreviated titleSPCI-XI
CountrySweden
CityJonkoping
Period04/09/201707/09/2017

Keywords

  • Austempered ductile iron
  • Heat treatment
  • Silicon solution strengthening

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