Change search
ReferencesLink to record
Permanent link

Direct link
THE EVALUATION OF NON-METALLIC INCLUSIONS IN CALCIUM-TREATED STEEL BY USING ELECTROLYTIC EXTRACTION
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This study aims on characterization of non-metallic inclusions (oxides and sulfides) in steel with and without Calcium treatment. In this paper, the three-dimensional (3-D) investigation method of inclusions on film filter after Electrolytic Extraction (EE) of steel samples is applied on two different steel grades (280, 316L). Image analysis of non-metallic inclusions is carried out on Scanning Electron Microscope (SEM) images following with inclusion characteristic analysis. Steel samples with calcium treatment in the production process and reference samples was investigated and compared in density, size and composition.

It shows that higher magnification and larger inclusion size correspond to more accurate result. With restriction of equipment and measurement, 2μm is the smallest size could be measured in ×500 magnification within 5% error.

The comparison of distribution of inclusions varies with different zones: center has the largest size with least number of NMI; surface has the smallest size with largest number of NM; middle part has the median properties.

In 316L steel, Ca treatment increases the number of oxides inclusions significantly; the content of Ca and Si in oxides inclusions is also increased. Two shapes of oxides inclusions, oval and elongated ones, are found with Ca treatment.

In 280 steel, the total amount of NMI decreases slightly with Ca treatment; CaS is found in spherical inclusions; Because of earlier formation of larger size spherical inclusions, higher Ca content is found than that in smaller size spherical inclusions.

Place, publisher, year, edition, pages
2016.
Keyword [en]
Steel, Electrolytic Extraction, Non-metallic inclusion, Calcium treatment
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-191786OAI: oai:DiVA.org:kth-191786DiVA: diva2:957615
Subject / course
Applied Process Metallurgy
Educational program
Master of Science - Engineering Materials Science
Presentation
2016-06-09, 14:00 (English)
Supervisors
Examiners
Available from: 2016-09-16 Created: 2016-09-02 Last updated: 2016-09-16Bibliographically approved

Open Access in DiVA

fulltext(3267 kB)2 downloads
File information
File name FULLTEXT01.pdfFile size 3267 kBChecksum SHA-512
904bc5388eb8c8ae243c34f89cd9d2844f9c94a47a972f1cdefc26d04a44fa8e96e4060091e90c60561080199b8c0b7bd6a9ec9010d568aac01ba978021aac00
Type fulltextMimetype application/pdf

By organisation
Materials Science and Engineering
Metallurgy and Metallic Materials

Search outside of DiVA

GoogleGoogle Scholar
Total: 2 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 8 hits
ReferencesLink to record
Permanent link

Direct link