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Density and thermal expansion coefficients of liquid and austenite phase in lamellar cast iron

China Foundry 2020年第2期17卷 127-136页

作者： kristina hellstrm Vasile-Lucian Diaconu Attila Diószegi School of Engineering J.nk.ping UniversitySweden

Volume change related defects formation mechanisms are an important detracting phenomenon in production of complex shaped cast *** different technical alloys,cast iron behaves in a complex manner due to the combined volume change of the formed *** liquid and the austenitic phase are contracting while the graphite phase is expanding during the *** complex volume change in combination with complex casting shapes causes a considerable deviation from isotropy in the solidification *** mentioned difficulties are considered the main reason why an extensive research work is condensed in the literature within this *** multitude of reported experimental set up and the various efforts to interpret the volume change phenomena in terms of density and thermal expansion coefficients makes the results difficult to compare from different *** these difficulties in mind,the present paper presents a broad experimental series and measures unidirectional linear deformation of an industrially spread lamellar cast iron alloy system(Fe-C-2Si)using the push-rod based dilatometer *** measurements are divided into two major groups with respect to the liquid iron deformation over the liquidus temperature line,and the austenite deformation below the solidus temperature *** obtained results are interpreted as thermal expansion coefficients,density variation slopes,and density data at the liquids and solidus *** obtained results are compared with literature data and with calculated values by the Thermo Calc software.

关键词： density thermal expansion coefficient dilatometer castiron Fe-C-2Si CALPHAD

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