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Effects of Carbon Content and Solidification Rate on the Thermal Conductivity of Grey Cast Iron

Tsinghua Science and Technology 2008年第2期13卷 170-176页

作者： daniel holmgren Attila Diószegi Ingvar L. Svensson Department of Mechanical Engineering and Component Technology Jnkping University

The thermal conductivity/diffusivity of pearlitic grey irons with various carbon contents was investigated by the laser flash method. The materials were cast in controlled thermal environments producing three dissimilar cooling rates. The cooling rates together with the carbon content largely influence the thermal conductivity of grey iron. Linear relationships exist between the thermal conductivity and the carbon content, the carbon equivalent, and the fraction of the former primary solidified austenite transformed into pearlite. The results show that the optimal thermal transport properties are obtained at medium cooling rates. Equations are given for the thermal conductivity of pearlite, solidified as pre-eutectic austenite, and the eutectic of grey iron. The thermal conductivity of pearlitic grey iron is modelled at both room temperature and elevated temperatures with good accuracy.

关键词： grey iron thermal conductivity thermal diffusivity carbon content carbon equivalent color etching graphite morphology eutectic cell size

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Effects of carbon content and solidification rate on thermal conductivity of grey cast iron

引用

China Foundry 2007年第3期4卷 210-214页

作者： daniel holmgren Attila Diószegi Ingvar L.Svensson Jnkping University Dept. of Mechanical Engineering/Component TechnologyJnkpingSE-551 11Sweden

The thermal conductivity or diffusivity of pearlitic grey irons with various carbon contents is investigated by the laser flash method. The materials are cast in controlled thermal environments and produced in three dissimilar cooling rates. The cooling rate together with the carbon content largely influence the thermal conductivity of grey iron. Linear relationships exist between the thermal conductivity and the carbon content,the carbon equivalent and the fraction of former primary solidified austenite transformed into pearlite. The work shows that optimal thermal transport properties are obtained at medium cooling rates. Equations describing the thermal conductivity of pearlite,solidified as pre-eutectic austenite,and the eutectic of grey iron are derived. The thermal conductivity of pearlitic grey iron is modeled at both room temperature and elevated temperature with good accuracy.

关键词： grey iron thermal conductivity thermal diffusivity carbon content carbon equivalent colour etching graphite morphology eutectic cell size primary austenite cooling rate

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