Microstructure and Service Properties of Mould Grey Iron after the Experience of Periodic Thermal Loads

Journal of Iron and Steel Research ›› 2014, Vol. 26 ›› Issue (5) : 42-48.

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Abstract

A kind of mould material of grey iron has been adopted for the experimental thermal simulation to the large ingot mould and its service operation. The microstructure and tensile strength of grey iron after different thermal history has been studied by Gleeble1500, OM, SEM and EDS. The relationship among thermal pretreatment and graphite morphology, pearlite content has been revealed. It has been found that the homogeneousness and continuity of as-cast specimens are obviously weak. And the microstructure and tensile strength have been improved observably after one cycle pretreatment, which is similar to a normalizing scheme. For the specimens after different cycles of thermal loads, the tensile strength at various temperatures decreases with periodic thermal loads increasing, which should be related to the graphite and matrix oxidization and decarburization at high temperature. The carbon content in grey cast iron reduces to 1.55% after 30 cycles of high temperature thermal pretreatment. Meanwhile, the floccus band around the graphite with a composition of silicon, manganese and iron oxides has been observed.

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grey cast iron / periodic thermal loads / microstructure / service properties

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Microstructure and Service Properties of Mould Grey Iron after the Experience of Periodic Thermal Loads[J]. Journal of Iron and Steel Research, 2014, 26(5): 42-48

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