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Abstract


Austenitic chromium-nickel cast steel is used for the production of machine parts and components operating under corrosive conditions combined with abrasive wear. One of the most popular grades is the GX2CrNi18-9 grade, which is used in many industries, and mainly in the chemical, food and mining industries for tanks, feeders, screws and pumps.
To improve the abrasion resistance of chromium-nickel cast steel, primary titanium carbides were produced in the metallurgical process by increasing the carbon content and adding titanium, which after alloy solidification yielded the test castings with the microstructure consisting of an austenitic matrix and primary carbides evenly distributed in this matrix.
The measured hardness of the samples in both as-cast conditions and after solution heat treatment was from 300 to 330HV0.02 and was higher by about 40-70 units compared to the reference GX2CrNi18-9 cast steel, which had the hardness of 258HV0.02.
The abrasive wear resistance of the tested chromium-nickel cast steel, measured in the Miller test, increased by at least 20% (with the content of 1.3 wt% Ti). Increasing the Ti content in the samples to 5.3 and 6.9 wt% reduced the wear 2.5 times compared to the common GX2CrNi18-9 cast steel.
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Bibliography

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[11] Tęcza, G. & Zapała, R. (2018). Changes in impact strength and abrasive wear resistance of cast high manganese steel due to the formation of primary titanium carbides. Archives of Foundry Engineering. 18(1), 119-122.
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[13] Tęcza, G. (2019). Selected wear resistant cast steels with Ti, Nb, V, W and Mo carbides. Katowice-Gliwice: Wydawnictwo Komisja Odlewnictwa PAN. (in Polish).
[14] Kalandyk, B., Starowicz, M., Kawalec, M. & Zapała, R. (2013). Influence of the cooling rate on the corrosion resistance of duplex cast steel. Metalurgija. 52(1), 75-78.
[15] Charchalis, A., Dyl, T., Rydz, D., Stradomski, G. (2018). The effect of burnishing process on the change of the duplex cast steel surface properties. Inżynieria Materiałowa. 6(226), 223-227.
[16] Dyja, D., Stradomski, Z., Kolan, C. & Stradomski, G. (2012). Eutectoid Decomposition of δ-Ferrite in Ferritic-Austenitic Duplex Cast Steel - Structural and Morphological Study. Materials Science Forum. 706-709, 2314-2319.
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Authors and Affiliations

Grzegorz Tęcza
ORCID: ORCID

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Abstract

The essence of ablation casting technology consists in pouring castings in single-use moulds made from the mixture of sand and a watersoluble binder. After pouring the mould with liquid metal, while the casting is still solidifying, the mould destruction (washing out, erosion) takes place using a stream of cooling medium, which in this case is water. This paper focuses on the selection of moulding sands with hydrated sodium silicate for moulds used in the ablation casting. The research is based on the use of Cordis binder produced by the Hüttenes-Albertus Company. It is a new-generation inorganic binder based on hydrated sodium silicate. Its hardening takes place under the effect of high temperature. As part of the research, loose moulding mixtures based on the silica sand with different content of Cordis binder and special Anorgit additive were prepared. The reference material was sand mixture without the additive. The review of literature data and the results of own studies have shown that moulding sand with hydrated sodium silicate hardened by dehydration is characterized by sufficient strength properties to be used in the ablation casting process. Additionally, at the Foundry Research Institute in Krakow, preliminary semi-industrial tests were carried out on the use of Cordis sand technology in the manufacture of moulds for ablation casting. The possibility to use these sand mixtures has been confirmed in terms of both casting surface quality and sand reclamation.

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Authors and Affiliations

M. Hosadyna-Kondracka
K. Major-Gabryś
J. Kamińska
A. Grabarczyk
M. Angrecki

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