Change search
ReferencesLink to record
Permanent link

Direct link
Three-dimensional Investigations of Different Sulfides in Steels 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]

The emphasis of this study is focusing on three-dimensional (3D) investigations of the manganese sulfide (MnS) inclusions characteristics in steels by using electrolytic extraction (EE). Two steel grades, 42CrMo4 and 157C, heat treated (HT) at 900 oC were investigated. 42CrMo4 steel samples were heat treated for 5, 10, 15 and 30 minutes while 157C steel samples were heat treated for 5 minutes. Samples of 42CrMo4 were taken from middle zone of an as-cast steel bar while that for grade 157C were taken from 3 different zones (centre, middle and surface). Inclusions were collected on film filters and analyzed by SEM for classification and determination of their characteristics including the size, number density (Nv), morphology and composition. The aspect ratio (AR) as well as particle size distribution (PSD) were also compared for steel samples conducted at various HT times. The result showed that EE is a reliable method of investigation inclusion characteristics. The inclusions were classified into 3 types according to their morphology and composition. Type I was elongated rod-like MnS, type II was coarsened sheet-like MnS and type III was spherical MnS inclusions. In addition, HT significantly reduced the Nv and fairly reduced AR but no significant reduction in size observed. The peak of PSD decreased with an increased HT time. The change of Nv, length, AR and PSD could be altered because of uneven inclusion distribution in filter and different sampling positions.

Place, publisher, year, edition, pages
2016. , 80 p.
Keyword [en]
Electrolytic extraction (EE), Manganese sulfides (MnS), Heat treatment (HT), Size, Number density per unit volume (Nv), Morphology, Aspect ratio (AR), Particle size distribution (PSD)
National Category
Other Materials Engineering Other Materials Engineering
URN: urn:nbn:se:kth:diva-195349OAI: diva2:1044324
Subject / course
Applied Process Metallurgy
Educational program
Master of Science - Engineering Materials Science
2016-09-30, Stockholm, 13:00 (English)
Available from: 2016-11-07 Created: 2016-11-02 Last updated: 2016-11-07Bibliographically approved

Open Access in DiVA

fulltext(4361 kB)24 downloads
File information
File name FULLTEXT01.pdfFile size 4361 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Materials Science and Engineering
Other Materials EngineeringOther Materials Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 24 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: 16 hits
ReferencesLink to record
Permanent link

Direct link