Manufacturing Technology 2022, 22(3):288-296

The Progress of Bainitic Transformation During Austempering in Connection with the Alloying of Unconventional AHS Steels

©těpán Jeníček ORCID..., Kateřina Opatová ORCID..., Ludmila Kučerová ORCID..., Ivan Vorel ORCID...
University of West Bohemia, Regional Technological Institute, Univerzitní 22, Pilsen, Czech Republic

Incomplete bainitic transformation during austempering treatment is mainly caused by the supersatu-ration of austenite with carbon. Such supersaturated austenite becomes more stable and further stabi-lization is led by silicon alloying. Stable austenite does not transform and remains in the structure as so-called residual austenite. Therefore, carbides, which are desirable in a conventional bainitic struc-ture, cannot be formed and carbide free bainite is formed. The positive effect of silicon and carbon on austenite stabilization in CFB structures has already been demonstrated and described. However, another element that is crucial in the incomplete bainitic transformation is chromium. The influence of chromium on the development of microstructure in unconventional AHS steels during austemper-ing is discussed in the experiment in this paper.

Keywords: Austempering, AHSS, Chromium, Silicon, RA
Grants and funding:

The present contribution has been prepared with the support of the student grant competition of University of West Bohemia in Pilsen, SGS 2019-019.

Received: August 30, 2021; Revised: March 23, 2022; Accepted: June 22, 2022; Prepublished online: June 22, 2022; Published: July 1, 2022  Show citation

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Jeníček ©, Opatová K, Kučerová L, Vorel I. The Progress of Bainitic Transformation During Austempering in Connection with the Alloying of Unconventional AHS Steels. Manufacturing Technology. 2022;22(3):288-296.
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