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Regression Model Describing the Thermal Conductivity of Various Cast Irons
Jönköping University, School of Engineering, JTH. Research area Materials and Manufacturing - Casting. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
2010 (English)In: Solidification and Gravity V, Zurich: Trans Tech Publications , 2010, Vol. 649, 499-504 p.Conference paper, Published paper (Refereed)
Abstract [en]

The thermal conductivity of various grades of pearlitic cast iron has been modelled with good results by means of regression analysis. The experimental thermal conductivity data, which the modelling is based on, were obtained by the laser flash method. The microstructure was investigated by digital image analysis combined with a colour etching technique. The model developed takes the carbon content, the silicon content, the nodularity as well as the fraction of cementite into consideration. The graphite morphologies of the samples investigated were lamellar, compacted and spheroidal.

Place, publisher, year, edition, pages
Zurich: Trans Tech Publications , 2010. Vol. 649, 499-504 p.
Keyword [en]
Thermal Conductivity, Modelling, Lamellar graphite Iron, Compacted Graphite Iron, Spheroidal graphite Iron, Microstructure
Identifiers
URN: urn:nbn:se:hj:diva-8604OAI: oai:DiVA.org:hj-8604DiVA: diva2:213057
Conference
5th International Conference on Solidification and Gravity
Available from: 2009-04-27 Created: 2009-04-27 Last updated: 2010-09-09Bibliographically approved
In thesis
1. On the Microstructure and the Thermal Conductivity in Compacted Graphite Iron
Open this publication in new window or tab >>On the Microstructure and the Thermal Conductivity in Compacted Graphite Iron
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Compacted graphite iron (CGI) is a cast iron material that has gained much attention due to its attractive material properties which are intermediate between those of grey and ductile cast iron. In the automotive industry compacted graphite iron has become an interesting alternative material to grey cast iron in components like cylinder blocks or cylinder heads. The reason for this interest is the higher strength found in CGI. However, one disadvantage is the lower thermal conductivity of CGI compared to grey cast iron. The aim of the present work is to investigate how chemical composition and cooling rate affects the microstructure in compacted graphite iron and trying to relate the microstructure to the thermal conductivity. The effect of an austempering heat treatment process on some material properties in CGI, grey and ductile cast iron is also investigated.

 

The austempering heat treatment was shown to have a significant influence on many of the material properties investigated. The hardness was increased, while the thermal conductivity was reduced, for all three graphite morphologies observed. Scuffing resistance increased considerably for the austempered grey iron but was slightly reduced for the other two austempered morphologies. The ultimate tensile strength in bending was reduced in the austempered grey iron and CGI samples but slightly increased in the ductile iron sample.

 

It was confirmed that alloying elements like magnesium increased nodularity, while copper and tin promoted formation of pearlite in CGI. Silicon had a ferrite promoting effect as well as an inoculating effect and chromium and molybdenum promoted formation of carbides. The thermal conductivity was highly affected by the fraction of ferrite as well as nodularity and addition of carbon and silicon. Based on these results a mathematical model was developed for calculation of the thermal conductivity at various temperatures. 

Place, publisher, year, edition, pages
Göteborg: Chalmers University of Technology, 2009. 90 p.
Series
Research Series from Chalmers University of Technology, ISSN 1652-8891 ; 46/2009
Keyword
Compacted graphite iron, Microstructure, Thermal conductivity, Ferrite, Cementite, Nodularity, Mathematical modelling, Laser flash technique, Austempering
Identifiers
urn:nbn:se:hj:diva-8606 (URN)
Presentation
2009-03-27, E1405, Gjuterigatan 5, Jönköping, 10:00 (Swedish)
Opponent
Supervisors
Available from: 2009-05-04 Created: 2009-04-27 Last updated: 2009-05-04Bibliographically approved

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Selin, Martin

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