Effect of Zr additions on non-metallic inclusions in X11CrNiMo12 steel

Burja, Jaka (author), Koležnik, Mitja (author), Šetina Batič, Barbara (author), Medved, Jože (author)

The production of clean steel is associated with high-quality steel grades for demanding applications. The formation of oxide inclusions mainly depends on the deoxidation practice; it is usually carried out through Al additions, but alumina inclusions can have detrimental effects. An alternative zirconium inclusion modification was used in a creep-resistant steel to improve the cleanliness of laboratory-made steel. The thermodynamics behind the inclusion modification are presented, the reaction products are identified and the steel cleanliness improvement is quantified. The resulting influence of zirconium addition on non-metallic inclusions and mechanical properties is discussed. While the Zr additions drastically reduce the non-metallic inclusion size and area, additions above a certain amount result in the formation of zirconium nitrides that ultimately soften the martensitic steel due to the depletion of nitrogen in solid solution.

• Language: English
• Keywords: clean steel, non-metallic inclusions, Zr addition, creep-resistant steel, microstructure
• 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: 2020
• Number of pages: 9 str.
• Numbering: Vol. 10, iss. 9, art. 1183
• PID: 20.500.12556/RUL-134280
• UDC: 621:669:67.017
• ISSN on article: 2075-4701
• DOI: 10.3390/met10091183
• COBISS.SI-ID: 27175683
• Publication date in RUL: 04.01.2022

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: 02.09.2020

Secondary language

• Language: Slovenian
• Keywords: čisto jeklo, nekovinski vključki, Zr dodatek, jeklo proti lezenju, mikrostruktura

Projects

• Funder: Other - Other funder or multiple funders
• Funding programme: Republic of Slovenia
• Acronym: ČMRLJ

• Funder: EC - European Commission
• Funding programme: European Regional Development Fund
• Acronym: ČMRLJ