Metallurgy and Foundry Engineering
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ISSN 1230-2325
e-ISSN: 2300-8377
Issue Date
2015
Volume
Vol. 41
Number
No. 2
Description
Journal Volume
Metallurgy and Foundry Engineering
Vol. 41 (2015)
Projects
Pages
Articles
Analysis of selected technological properties of green sands with starch-based additives
(2015) Drożyński, Dariusz; Kurleto, Żaneta; Kaczmarska, Karolina; Grabowska, Beata
This paper presents the results of determining the effect of the addition of native starch and mineral-starch mixes on selected technological properties of sands. The study was carried out on the permeability, compressive strength, and wear resistance of molding. Green sand with bentonite and silica sand was compared to green sand with the addition of Superior Standard native starch or the addition of a mineral-starch composition in the form of binder Albertine F/1. The main difference in applied starch materials is the characteristic property of native starch which is insoluble in cold water. Therefore, it was difficult to bond water added to molding sand during mixing of the ingredients in this case. However, the Albertine F/1 starch-based binder is a mixture of starch and aluminosilicates, whereas the bonding of water added into molding sand during ingredient mixing is more efficient.
High-temperature corrosion resistance of steel-matrix composites
(2015) Sulima, Iwona; Homa, Marta; Malczewski, Piotr
The results of corrosion studies of composite materials obtained by two methods of powder metallurgy are presented in the article. The main goal of the studies was to determine the high-temperature corrosion resistance of steel-matrix composites reinforced with 8 vol.% TiB2. Thermogravimetric analyses were conducted at 1100°C in air during a 24 h cycle. The microstructure of the composite after thermogravimetric studies was observed with a scanning electron microscope.
Experimental study of the filling of thin-walled investment castings in 17-4PH stainless steel
(2015) Raza, Mohsin; Svenningsson, Roger; Irwin, Mark
Global requirements of lower fuel consumption and fewer emissions are increasing the demand for decreasing the weight of cast components. Reducing the wall thickness of cast components is one way of achieving this. The aim of this work was to investigate castability of 17-4PH stainless steel in thin-walled test geometries (?2 mm). The casting trials were performed to investigate fluidity as a function of casting temperature, mold preheat temperature, and filling systems in thin-walled sections. It was observed that fluidity in a top-gated configuration is strongly affected by casting temperatures, however, the effect of mold preheat temperature on fluidity was not significant. On the other hand, castings made in bottom-gated configuration were more stable, and fluidity was not significantly affected by variation in casting temperature and mold preheat temperature. Fewer porosity and flow-related defects were observed in the bottom-gated system as compared to the top-gated one.