Investigation on dynamic strain aging behaviour of ferritic-pearlitic ductile cast irons
Jalava, Kalle; Laine, Jarkko; Vaara, Joona; Frondelius, Tero; Orkas, Juhani (2019-11-05)
Kalle Jalava, Jarkko Laine, Joona Vaara, Tero Frondelius & Juhani Orkas (2020) Investigation on dynamic strain aging behaviour of ferritic-pearlitic ductile cast irons, Materials Science and Technology, 36:2, 160-167, DOI: https://doi.org/10.1080/02670836.2019.1685760
© The Author(s) 2019. This is an Accepted Manuscript of an article published by Taylor & Francis in Materials Science and Technology on 05 Nov 2019, available online: http://www.tandfonline.com/10.1080/02670836.2019.1685760.
https://rightsstatements.org/vocab/InC/1.0/
https://urn.fi/URN:NBN:fi-fe2022012510232
Tiivistelmä
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.
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