On Thermal Expansion and Density of CGI and SGI Cast Irons

Author: Matsushita Taishi   Ghassemali Ehsan   Saro Albano Gómez   Elmquist Lennart   Jarfors Anders E. W.  

Publisher: MDPI

E-ISSN: 2075-4701|5|2|1000-1019

ISSN: 2075-4701

Source: Metals, Vol.5, Iss.2, 2015-06, pp. : 1000-1019

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Abstract

The thermal expansion and density of Compacted Graphite Iron (CGI) and Spheroidal Graphite Iron (SGI) were measured in the temperature range of 25–500 °C using push-rod type dilatometer. The coefficient of the thermal expansion (CTE) of cast iron can be expressed by the following equation: CTE = 1.38 × 10−5 + 5.38 × 10−8 N − 5.85 × 10−7 G + 1.85 × 10−8 T − 2.41 × 10−6 RP/F − 1.28 × 10−8 NG − 2.97 × 10−7 GRP/F + 4.65 × 10−9 TRP/F + 1.08 × 10−7 G2 − 4.80 × 10−11 T2 (N: Nodularity, G: Area fraction of graphite (%), T: Temperature (°C), RP/F: Pearlite/Ferrite ratio in the matrix).