Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Application of some modern analytical techniques for investigations of non-metallic inclusions in steel samples
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The non-metallic inclusions (NMI) have large influence on steel properties. Therefore, evaluation of inclusion size, number, composition and morphology by using modern analytical techniques are very important for control of steel production and steel quality. Three dimensional analysis method of electrolytic extraction is applied in this work. Metals are dissolved and undissolved inclusions are collected on the film filter. Scanning Electron Microscope (SEM) with Energy Dispersive Spectrometer (EDS) is applied to observe different non-metallic inclusions.

Apart from electrolytic extraction, several other different methods can be used to analyse the inclusions. Each of them has their advantages and drawbacks. A part of this work compares different methods for investigation of inclusions.

To modify the inclusion size, number and morphology, calcium or zirconium can be added in to the steel with certain amount according to the steel grade. This work discussed how inclusion size, number and morphology changed after the modification.

In samples of Heat A, the addition of Zr leads to the appearance of ZrO2 clusters. Large size particles disappeared while the peak value for the number of inclusions per unit volume didn’t decrease. The electrolytic extraction and fractional gas analysis (FGA) results show some differences on the inclusion compositions.

In samples of Heats B and C, the effect of calcium treatment is investigated. Calcium treatment modified the spinels with large content of Al2O3 into spherical CaS+CaO-MgO-Al2O3 inclusions. Large size inclusions were removed after calcium treatment.Key

Place, publisher, year, edition, pages
2018. , p. 46
Keywords [en]
Non-metallic Inclusions, Electrolytic Extraction, Fractional Gas Analysis, Zirconium Addition, Calcium Treatment
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-231963OAI: oai:DiVA.org:kth-231963DiVA, id: diva2:1231252
Subject / course
Materials Science and Engineering
Educational program
Master of Science - Engineering Materials Science
Supervisors
Examiners
Available from: 2018-07-06 Created: 2018-07-06 Last updated: 2018-07-06Bibliographically approved

Open Access in DiVA

fulltext(2343 kB)5 downloads
File information
File name FULLTEXT01.pdfFile size 2343 kBChecksum SHA-512
bdb0f0eeadcda6761e6d9062594223d928456e3068e359ea6080e3c1dcd38b2af1736d3b476185d237bd340a7c224168291943f53ad3fb2fec4c663488ea93d4
Type fulltextMimetype application/pdf

By organisation
Materials Science and Engineering
Materials Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 5 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

urn-nbn

Altmetric score

urn-nbn
Total: 14 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf