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2 Archives of Foundry Engineering

2 2010

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Initial assessment of secondary inoculation of grey cast iron

Soiński M. S., Wawrzyniec A.

Archives of Foundry Engineering

2010

Vol. 10, iss. 4

205--208

The effectiveness of secondary inoculation of cast iron, performed using four various inoculants, i.e. Foundry Grade, Superseed 75, Superseed Extra and Inoculin 900, has been determined in the work. The inoculants have been introduced into the cast iron initially modified with FeSi75. Structural examination of the treated alloy has revealed that the cast iron chilling tendency is reduced to the greatest degree by Foundry Grade and Superseed Extra. The most significant structure refining (assessed by the number of eutectic grains per unit area) has been obtained for Superseed Extra used as an inoculant. Also the achieved tensile strength has the largest value for this case (about 350 MPa), while for other cases it has ranged from 290 MPa to 310 MPa.

Initial assessment of effectiveness of some selected inoculants for grey cast iron

Soiński M. S., Wawrzyniec A.

Archives of Foundry Engineering

2010

Vol. 10, iss. 2

155--158

The influence of four inoculants: FeSi75, Zircinoc, Foundry Grade, and Inogen has been determined in the work. The additions have been introduced in the amount of 0,2% into the cast iron exibiting the degree of saturation SC = 0,824. The shape, the size, and the arrangement of graphite precipitates have been determined, as well as the cast iron matrix type; both the initial cast iron and the modified alloy have been examined, the latter cast after either 2 or 8 minutes after the inoculation treatment. Additionally the chilling tendency of the cast iron has been assessed, the number of eutectic cells has been determined, and mechanical properties (strength and hardness) of the alloy have been examined. It has been found that each of the inoculants significantly lowers the cast iron chilling tendency, however not to the same degree. Additionally, the graphite arrangement is changed from interdendritic one present in the initial cast iron to the arrangement of prevailing A type revealed in the modified alloy. The inoculation treatment leads to the distinct growth in the number of eutectic cells and to the increasing of cast iron tensile strength, the latter however not to the large extent.