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Structure Characteristics of Si/Si-Mo Ductile Irons Solidified on a Metallic Chill

Stan I., Anca D. E., Chisamera M., Riposan Iulian, Stan S.

Archives of Foundry Engineering

2025

Vol. 25, iss. 2

61--68

The present work focuses on the structure characteristics of three un-inoculated ductile cast irons (0.035-0.045%Mgres), at high content of Si and Mo (I. 4.55%Si/4.71%CE; II. 5.25%Si/5.05%CE; III. 4.80%Si-2.30%Mo/4.75%CE) solidified on a cast iron chill, in furan resin sand moulds. At 4.55%Si iron, there resulted a chilled zone at 6-8mm, with carbides presence, lower graphite amount, higher nodule count and ferrite amount. Si increasing up to 5.25%Si led to a limited affected surface zone (up to 3mm), characterised by no carbides and the highest nodule count. Mo addition led to the most extensive chilled zone (11-15mm), with the lowest amount of graphite and ferrite, and the highest carbides amount, at the lowest nodule count. All irons are characterised by Type V, slightly irregular spheroidal graphite morphology, typical for the Roundness Shape Factor RSF=0.62-0.75 range, at the highest position for I, intermediary for II and at the lowest position for III cast irons. A higher Graphite Nodularity (NG) level resulted when it was calculated according to ISO 16112:2017 [CGI], comparing to ISO 945-4-2019 [DI]. By the use of the Sphericity Shape Factor (with graphite real perimeter), an intermediary position of NG was obtained; it is recommended to avoid the castings rejection, due to the lower values of NG resulted from ISO 945-4-2019 stipulation for High-Si DI. The increase of Si negatively affected the nodularity, while the supplementary Mo alloying led to the lowest NG. The chill solidification appears to have less effect on the NG of 4.55%Si iron, with the maximum influence for 4.8%Si-2.3%Mo iron and by the imposed RSF=min.0.80, especially for 5.25%Si content.

Wykorzystanie sondowań elektrooporowych do rozpoznania spągu złoża iłów Blanowice C

Badera J., Pierwoła J., Stan I.

Górnictwo Odkrywkowe

2004

R. 46, nr 3/4

41-44

Perspektywy zasobowe złoża iłów Blanowice C zależą w znacznej mierze od morfologii i głębokości zalegania stropu piaskowca kościeliskiego, tworzącego spąg serii ilastej. Do rozpoznania wgłębnej struktury geologicznej wykorzystano szybką i prostą metodę sondowań elektrooporowych. Uzyskany na tej podstawie opornościowy model górotworu posiada charakter trój- lub czterowarstwowy, co koreluje się dobrze z profilem litologicznym osadów środkowojurajskich. Wydzielone warstwy są jednorodne geofizycznie i geologicznie. Antropogeniczne przekształcenia górotworu mogą wpływać negatywnie na wartość interpretacyjną pomiarów, co jest dokuczliwe zwłaszcza w przypadku małych złóż. Geofizyczny obraz górotworu sugeruje, że morfologia stropu piaskowca jest urozmaicona, a zasoby zalegające pod poziomem aktualnego rozpoznania eksploatacyjnego mogą być znikome.

Reserves of the Blanowice C clay deposit are depended mainly on the depth and morphology of the Kościelisko sandstone building the bottom of clayey series. For recognition of the subsurface geological structure the quick and simple electrical sounding was used. The obtained resistance model of the rock-mass has 3- or 4-layer character. It is conformable to the lithological profile of the Middle Jurassic sediments in this region. The distinguishing layers are homogenous in the geophysical and geological sense. Antropogenical transformations of the rock-mass have negative influence on the interpretative value of measurements, what is troublesome particulary in a case of small deposits. The geophysical model of the rock-mass suggests that morphology of the top surface of sandstone is diversified and the reserves of raw material can be less then valued in the geological documentation.