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The low-aluminium cast iron of reduced silicon content treated with cerium mischmetal

Soiński M. S., Susek P., Hübner K., Mierzwa P.

Archives of Foundry Engineering

2008

Vol. 8, iss. 2

123-128

The work presents the effect of cerium mischmetal used in quantities of 0.1 and 0.2 wt-% and ferrosilicon used in quantities from 0.5% to 1.5% on the alloy matrix and the shape of graphite precipitates in the low-aluminium cast iron from seven heats, basing on the examination of its structure. The hypereutectic cast iron of the relatively high carbon content (4.0÷4.2%) at the prior-to-treatment silicon and manganese content equal to ca. 0.6% and ca. 0.04%, respectively, has been examined. It has been found that the performed treatment leads to the change in the alloy matrix from the nearly almost pearlitic to the ferritic-pearlitic one accompanied by changes in the shape of graphite precipitates. Due to applying both of the mentioned substances in the above stated amounts the graphite precipitates in cast iron have taken the shape of nodular and vermicular ones, and no presence of flake graphite has been revealed. A quantitative analysis of the performed treatment i.e. determining the fractions of graphite precipitates of different shapes has been possible by means of a computer image analyser.

Badania nad wytwarzaniem podeutekfycznego żeliwa niskoaluminiowego z grafitem zwartym

Soiński M. S., Grzesiak K.

Archiwum Odlewnictwa

2004

R. 4, nr 11/2

184--189

W pracy przedstawiono wyniki badań struktury żeliwa o zawartości około 3% aluminium, współczynniku nasycenia Sc, ~0,9, obrobionego mieszanką cerową dodaną w ilościach 0,05% ÷ 0,20% i modyfikowanego zaprawą SB-5. Stwierdzono występowanie w żeliwie wydzieleń grafitu w postaci zwartej, ze stosunkowo niewielkim udziałem grafitu kulkowego. Osnowa żeliwa była ferrytyczno-perlityczna.

The work presents the results of structural examinations of cast iron containing about 3% of aluminium, exhibiting the degree of saturation Sc ~0.9, treated with cerium mischmetal added in the amount of 0.05÷0.20%, and modified with SB-5 master alloy. It has been found that mainly compact graphite precipitates occur in the cast iron, being accompanied by a relatively small fraction of nodular graphite. The cast iron matrix is the ferritie-pearlitic one.