High-temperature oxidation behaviour of AISI H11 tool steel

Balaško, Tilen (author), Vončina, Maja (author), Burja, Jaka (author), Šetina Batič, Barbara (author), Medved, Jože (author)

The high-temperature oxidation of hot-work tool steel AISI H11 was studied. The high-temperature oxidation was investigated in two conditions, the soft annealed condition, and the hardened and tempered condition. First, calculations of the compositions of the oxide layers formed were carried out using the CALPHAD method. The samples were oxidised in a chamber furnace and in a simultaneous thermal analysis instrument, for 100 h in the temperature range between 400 °C and 700 °C. The first samples were used for metallographic (optical microscopy and scanning electron microscopy) and X-ray diffraction analysis of the formed oxide layers, and the second ones for the analysis of the oxidation kinetics by thermogravimetric analysis. Equations describing the high-temperature oxidation kinetics were derived. The kinetics can be described by three mathematical functions, namely: exponential, parabolic, and cubic. However, which function best describes the kinetics depends on the oxidation temperature and the thermal condition of the steel. Hardened and tempered samples have been shown to oxidise less, resulting in a slower oxidation rate. The oxide layers consist of three sublayers, the inner one being spinel-like oxide (Fe, Cr)$_3$O$_4$, the middle one a mixture of magnetite and hematite and the outer one of hematite. At 700 °C there is also some wüstite in the inner oxide sublayer of the soft annealed sample.

• Language: English
• Keywords: high-temperature oxidation, AISI H11 tool steel, thermogravimetry, CALPHAD, kinetics
• 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: 2021
• Number of pages: 27 str.
• Numbering: Vol. 11, iss. 5, art. 758
• PID: 20.500.12556/RUL-135437
• UDC: 669
• ISSN on article: 2075-4701
• DOI: 10.3390/met11050758
• COBISS.SI-ID: 62092547
• Publication date in RUL: 15.03.2022

Record is a part of a journal

• Title: Metals
• Shortened title: Metals
• Publisher: MDPI AG
• ISSN: 2075-4701
• COBISS.SI-ID: 15976214

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.
• Licensing start date: 04.05.2021

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P2-0344
• Name: Napredna metalurgija

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