Influence of Titanium on Mechanical and Thermal Properties in Lamellar Cast Iron
Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
This work focuses on the thermal and mechanical properties of two highly hypoeutectic, two hypoeutectic and four hypereutectic grey cast iron with different titanium content are studied.
In order to collect required experimental data, laser flash (LFA), differential scanning calorimeter (DSC), dilatometer and tensile test were performed.
Micrographs from the polished specimens were captured and graphite fraction and morphology were studied through qualitative and quantitative measurements. Subsequently, the same samples were colour etched with picric acid in order to perform a qualitative analysis of the matrix.
It was concluded that titanium has influence in the mechanical properties by improving the UTS value, besides it has a greater effect on the hypereutectic (increase 50% UTS value) than in hypoeutectic concentrations( increase 16%) and the highest UTS values is achieved in lowest carbon equivalent content.
Concerning the influence of titanium on thermal properties, titanium has not any influence on the expansion coefficient, instead titanium has a negative influence on the thermal diffusivity and which value is greater the higher the carbon content in the concentration while in high titanium content samples the thermal diffusivity increases proportionally with the amount of graphite due to titanium influence, samples have D-type graphite.
About graphite, it has been seen that concentrations with more than 0,4% of titanium content have D-type graphite and their graphite fraction increases proportionally with the amount of carbon equivalent. Besides concentrations with D-type graphite have best mechanical properties and worst thermal properties while concentrations with C-type graphite have the best thermal properties and the worst thermal properties.
Regarding to the thermal conductivity, adding titanium on concentrations close to eutectic causes a worsening of thermal conductivity while adding 0,45% of titanium on the highly hypoeutectic concentration causes better thermal conductivity at high temperature than a hypoeutectic concentration.
Place, publisher, year, edition, pages
2016. , 89 p.
JTH research report, ISSN 1404-0018
Cast Iron, Titanium. Ultimate Tensile Strength (UTS), thermal conductivity, lamellar graphite iron, type-D graphite
IdentifiersURN: urn:nbn:se:hj:diva-31253ISRN: JU-JTH-MTA-1-20160068OAI: oai:DiVA.org:hj-31253DiVA: diva2:952941
2016-05-24, E1418, Gjuterigatan 5, Jönköping, 08:30 (English)
Diószegi, Attila, ProffesorHernando, Juan Carlos, Phd
Andersson, Nils-Eric, Assistant Professor