Study of austempering kinetics of high silicon bainitic cast steels

This study investigates the effect of chemical composition and microsegregation on the bainitic transformation of high Si cast steels at two different austempering temperatures. The advance of the bainite precipitation as a function of time and temperature was monitored through measurements of the a...

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Bibliographic Details
Published inInternational journal of cast metals research (Online) Vol. 32; no. 1; pp. 21 - 30
Main Authors Tenaglia, Nicolás Emanuel, Rivas, Ana Luisa, Boeri, Roberto Enrique, Massone, Juan Miguel, Basso, Alejandro Daniel
Format Journal Article
LanguageEnglish
Published Taylor & Francis 02.01.2019
Subjects
austempering
carbide-free bainite
Cast steel
high silicon
microsegregation
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Summary:This study investigates the effect of chemical composition and microsegregation on the bainitic transformation of high Si cast steels at two different austempering temperatures. The advance of the bainite precipitation as a function of time and temperature was monitored through measurements of the amount of retained austenite by X-ray diffraction, the evolution of hardness and microstructural characterization. The results showed that the bainitic transformation starts preferentially at zones with lower contents of alloying elements but later covers the entire matrix. The austempering heat treatments resulted in an apparently homogeneous bainitic microstructure throughout the entire matrix after a short period of time. The results encourage the continuation of the development of high Si steels suitable to produce carbide-free austempered cast parts.
ISSN:1364-0461
1743-1336
DOI:10.1080/13640461.2018.1505423