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Mechanism of silicon influence on chills in ductile iron

100%

Górny M.

2009

tom Vol. 9, iss. 1

147-150

In the present work an analytical expression that combines the susceptibility of liquid cast iron to solidify according to the Fe-C-X metastable system (also known as the chilling tendency of cast iron, CT) is proposed. A relationship between CT and several factors has been developed. In particular the CT is related to the critical wall thickness (Scr), below which the chill is formed. Theoretical calculations of Scr were made and then compared with experimental outcome for ductile iron melts. The predictions of the theoretical analysis are in rather good agreement with the experimental data.The results can be used as a guide for a better understanding of the effect of technological variables such as the melt chemistry, the holding time and temperature, the spheroidizing and inoculation practice, the resulting nodule count and the type of mold material and pouring temperature, on the resultant chill of the ductile iron.

Fading of inoculation effects in ductile iron

100%

Fraś E. , Górny M.

tom Vol. 8, iss. 1 spec.

83--88

In work it has been shown results of investigations of influence of time lapsed form inoculation process on graphite nucleation potential represented by: number of graphite nodules N and Nv maximum undercooling ΔTm, during solidification of graphite eutectic, absolute chilling tendency CT and critical casting diameter dkr, under which cementite eutectic occur (so-called chills). Moreover it has been estimated rate of change of N and Nv, ΔTm, CT and dkr. Also, it has been proved that after one minute since the moment of inoculation process about 35% of graphite nucleation potential is lost, by 40% chilling tendency, by 70% increases maximum undercooling for graphite eutectic and by nearly 40% casting diameter has to be increased in order to avoid chills.

Mechanism of free sulfur influence on the eutectic cell count and transition from graphite to cementite eutectic in cast iron Part I. Theoretical background

84%

Fraś E. , Górny M.

2010

tom Vol. 10, iss. 1 spec.

53--56

In this work an analytical solution of general validity is used to explain the mechanism of free sulfur influence on the cell count and on the transition from graphite to cementite eutectic in cast iron. It is found that this transition can be related to the nucleation potential of graphite (represented by eutectic cell count Nv), the growth rate coefficient of graphite eutectic cell, μ the temperature range, ΔTsc and the pre-eutectic austenite volume fraction, fγ.