Change search
ReferencesLink to record
Permanent link

Direct link
Relation between microstructure features, cooling curves and mechanical properties in CGI-cylinder block
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]


The purpose of this master thesis was to evaluate variations in solidification and cooling rate in compacted graphite iron prototype cylinder blocks and for each position relate this to the microstructure and also relate the microstructure to mechanical properties. This has been done to increase the knowledge to predict mechanical properties in cast iron components.

There were three sample categories; reference-, tensile test- and thermocouple samples. The investigation included analysis of cooling curves, SinterCast parameters, image analysis, measured hardness and tensile strength. Thermocouples of type N were used at interesting positions for observation of the cooling behaviour and the image analysis was carried out by the software Axio Vision SE64 by Carl Zeiss GmbH. The hardness was measured according to Brinell HBW 5/750 and tensile testing was performed according to standard SS-EN ISO 6892-1:2009.

It is concluded that the microstructure depend on many parameters, one of them is the position in the cylinder block. A relation between solidification time and the microstructure features; secondary dendrite arm spacing and eutectic cell size was observed. Because of dissimilarity in microstructure between the tensile test samples and thermocouple samples it is believed that the thermocouples have contributed with a cooling and/or nucleation effect. Considering the mechanical properties there is not solely the nodularity, eutectic cell size or secondary dendrite arm spacing that are the

controlling microstructure feature, more research needs to be made.

Place, publisher, year, edition, pages
2014. , 44 p.
Keyword [en]
Compacted graphite iron, CGI, Cooling curves, Microstructure
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-160819OAI: diva2:791234
External cooperation
Available from: 2016-10-18 Created: 2015-02-27 Last updated: 2016-10-18Bibliographically approved

Open Access in DiVA

fulltext(3720 kB)4 downloads
File information
File name FULLTEXT01.pdfFile size 3720 kBChecksum SHA-512
Type fulltextMimetype application/pdf

By organisation
Materials Science and Engineering
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 4 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

ReferencesLink to record
Permanent link

Direct link