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High-temperature oxidation behaviour of AISI H11 tool steel
ID Balaško, Tilen (Author), ID Vončina, Maja (Author), ID Burja, Jaka (Author), ID Šetina Batič, Barbara (Author), ID Medved, Jože (Author)

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Abstract
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 This link opens in a new window
UDC:669
ISSN on article:2075-4701
DOI:10.3390/met11050758 This link opens in a new window
COBISS.SI-ID:62092547 This link opens in a new window
Publication date in RUL:15.03.2022
Views:892
Downloads:109
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Record is a part of a journal

Title:Metals
Shortened title:Metals
Publisher:MDPI AG
ISSN:2075-4701
COBISS.SI-ID:15976214 This link opens in a new window

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

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