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Modification of Non-Metallic Inclusions in Stainless Steel by Addition of CaSi
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Processing.ORCID iD: 0000-0003-1309-9081
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Processing.
Sandv Mat Technol AB, S-81181 Sandviken, Sweden..
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Processing.ORCID iD: 0000-0001-9775-0382
2019 (English)In: METALS, ISSN 2075-4701, Vol. 9, no 1, article id 74Article in journal (Refereed) Published
Abstract [en]

The focus of this study involved comparative investigations of non-metallic inclusions in 316L stainless steel bars without and with Ca treatments. The inclusions were extracted by using electrolytic extraction (EE). After that, the characteristics of the inclusions, such as morphology, size, number, and composition, were investigated by using a scanning electron microscope (SEM) in combination with an energy dispersive X-ray spectroscopy (EDS). The following four types of inclusions were observed in 316L steels: (1) Elongated MnS (Type I), (2) MnS with hard oxide cores (Type II), (3) Undeformed irregular oxides (Type III), and (4) Elongated oxides with a hard oxide core (Type IV). In the reference sample, only a small amount of the Type III oxides (Al2O3-MgO-MnO-TiOx) existed. However, in Ca-treated 316L steel, about 46% of the observed inclusions were oxide inclusions (Types III and IV) correlated to gehlenite and to a mixture of gehlenite and anorthite, which are favorable for the machinability of steel. Furthermore, untransformed oxide cores (Al2O3-MgO-MnO) were also found in the inclusions of Type IV. The mechanism leading to different morphologies of oxide inclusions is also discussed.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 9, no 1, article id 74
Keywords [en]
stainless steel, Ca treatment, non-metallic inclusion, electrolytic extraction
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-246294DOI: 10.3390/met9010074ISI: 000459738500073Scopus ID: 2-s2.0-85060092047OAI: oai:DiVA.org:kth-246294DiVA, id: diva2:1298905
Note

QC 20190325

Available from: 2019-03-25 Created: 2019-03-25 Last updated: 2019-03-25Bibliographically approved

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Du, HongyingKarasev, AndreyJönsson, Pär

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