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Structure and mechanical properties of vermicular cast iron in cylinder head casting

Guzik E., Dzik S.

Archives of Foundry Engineering

2009

Vol. 9, iss. 1

175-180

The paper discusses the problem of grain density and ferrite content in microstructure of vermicular graphite iron cast in bars of different section diameters and cylinder head casting. The experimental results regarding the section effect demonstrate that the nodule count, grain density and ferrite content are all function of the cast bar diameter in this particular case ranging from 0.6 to 8.0 cm and microstructure and mechanical properties in the cylinder head. The nodule count (or grain density) has been reported to increase, while ferrite content was decreasing with decreasing casting diameter. The density number of the grains Nv has been related (by regression analysis) to the undercooling degree [...]. This paper describes the results of using a high-magnesium ferrosilicon alloy in cored wire (Mg recovery 40%) for the production of vermicular graphite cast irons at 'WSK-Rzeszów' Metallurgical Plant Ltd. for first series of cylinder head. The results of calculations and experiments have indicated the length of the cored wire to be injected basing on the initial sulfur content and weight of the treated melt. The paper presents a microstructure matrix and vermicular graphite in standard sample and different walled cylinder head castings. The results of numerous trials have shown that the magnesium cored wire process can produce high quality vermicular graphite irons, which its ideally suited to meet the current and future requirements of engine design and performance.