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Evolution of Non-Metallic Inclusions from FeTi70R Alloys during Alloying of Fe-40Ni-20Cr Steels
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2016 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344XArticle in journal (Refereed) PublishedText
Abstract [en]

In this study, the composition, size, and number of large non-metallic inclusions (>20μm) are investigated in a commercial refined FeTi70R alloy, which is used for deoxidation and alloying of different industrial high-quality steels. It is found that this ferroalloy contains different complex oxide inclusions, which sizes vary from 20 to 260μm. These different complex inclusions contain mostly CaO, SiO2, and TiOx. When adding FeTi70R alloy in the steel during the final stage of ladle treatment, these large size inclusions can significantly decrease the cleanliness and mechanical properties of steel. Therefore, the evolution and behavior of these inclusions after addition of this ferroalloy into the liquid iron or Fe-40Ni-20Cr steel are investigated in laboratory experiments. In addition, the results from the laboratory scale experiments are compared to results obtained from industrial heats using Alloy 825. A consideration of the evolution mechanism of large inclusions after an addition of a FeTi70R alloy helps to understand their behavior in the melt. It also helps to estimate their possible harmful effects on the quality of this steel grade during commercial production.

Place, publisher, year, edition, pages
John Wiley & Sons, 2016.
Keyword [en]
Alloy 825, FeTi70R alloy, Non-metallic inclusions, Alloying, Iron compounds, Nickel, Commercial productions, Evolution mechanism, Harmful effects, High quality steels, In-laboratory experiments, Ladle treatment, Large inclusions, Alloy steel
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-186770DOI: 10.1002/srin.201500428ScopusID: 2-s2.0-84963815499OAI: oai:DiVA.org:kth-186770DiVA: diva2:931397
Note

QC 20160527

Available from: 2016-05-27 Created: 2016-05-13 Last updated: 2016-05-27Bibliographically approved

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Kellner, Hans E OKarasev, AndreyJönsson, Pär
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