The impact of silicon on the solidification of duplex lightweight steels

Balaško, Tilen (author), Burja, Jaka (author), Medved, Jože (author)

Efforts are being made worldwide to transform road transport to minimise its contribution to greenhouse gas emissions, with a focus on reducing vehicle mass. Lightweight manganese–aluminium steels have gained popularity for this purpose due to their low density and combination of strength and plasticity. In this particular study, the solidification process of five lightweight manganese–aluminium steels with different silicon content was investigated. The steels were fabricated by inductive melting in a vacuum and remelted during further thermal analysis. A reference steel composition (Fe-14Mn-10Al-0.2Si-0.8C) was used, and the remaining four steels contained different amounts of silicon (0.5, 1.0, 2.0 and 4.0 mass%). The impact of silicon on solidification was analysed by thermodynamic calculations (CALPHAD method), differential thermal analysis and optical microscopy. The thermodynamic calculations gave good estimates for the liquidus and austenite liquidus temperatures, but higher solidus temperatures than the experimental results. The presence of silicon decreases the density and lowers the solidus and liquidus temperatures, resulting in a prolonged solidification interval. In addition, the spacing of the secondary dendrite arms decreases, except at a silicon concentration of 0.5 mass%, where an increase was observed compared to the reference steel.

• Language: English
• Keywords: lightweight steels, duplex steels, solidification, DTA, CALPHAD
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2023
• Number of pages: Str. 9993–10000
• Numbering: Vol. 148, iss. 19
• PID: 20.500.12556/RUL-152546
• UDC: 669
• ISSN on article: 1388-6150
• DOI: 10.1007/s10973-023-12381-0
• COBISS.SI-ID: 160875011
• Publication date in RUL: 27.11.2023

Record is a part of a journal

• Title: Journal of thermal analysis and calorimetry
• Shortened title: J. therm. anal. calorim.
• Publisher: Springer
• ISSN: 1388-6150
• COBISS.SI-ID: 13803815

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0050
• Name: Kovinski materiali in tehnologije