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Abstract

The cast alloys crystallizing in Fe-C-V system are classified as white cast iron, because all the carbon is bound in vanadium carbides. High

vanadium cast iron has a very high abrasion resistance due to hard VC vanadium carbides. However, as opposed to ordinary white cast

iron, this material can be treated using conventional machining tools. This article contains the results of the group of Fe-C-V alloys of

various microstructure which are been tested metallographic, mechanical using an INSTRON machine and machinability with the method

of drilling. The study shows that controlling the proper chemical composition can influence on the type and shape of the crystallized

matrix and vanadium carbides. This makes it possible to obtain a high-vanadium cast iron with very high wear resistance while

maintaining a good workability.

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Authors and Affiliations

J. Kozana
M. Kawalec
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Abstract

This paper presents the results of studies of high-alloyed white cast iron modified with lanthanum, titanium, and aluminium-strontium. The

samples were taken from four melts of high-vanadium cast iron with constant carbon and vanadium content and near-eutectic

microstructure into which the tested inoculants were introduced in an amount of 1 wt% respective of the charge weight. The study

included a metallographic examinations, mechanical testing, as well as hardness and impact resistance measurements taken on the obtained

alloys. Studies have shown that different additives affect both the microstructure and mechanical properties of high-vanadium cast iron.

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Authors and Affiliations

M. Kawalec
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Abstract

The paper presents the results of abrasive wear resistance tests carried out on high-vanadium cast iron with spheroidal VC carbides. The cast iron of eutectic composition was subjected to spheroidising treatment using magnesium master alloy. The tribological properties were examined for the base cast iron (W), for the cast iron subjected to spheroidising treatment (S) and for the abrasion-resistant steel (SH). Studies have shown that high-vanadium cast iron with both eutectic carbides and spheroidal carbides has the abrasion resistance twice as high as the abrasion-resistant cast steel. The spheroidisation of VC carbides did not change the abrasion resistance compared to the base high-vanadium grade.

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Authors and Affiliations

M. Kawalec
E. Olejnik
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Abstract

High-vanadium cast iron is the white cast iron in which the regular fibrous γ + VC eutectic with the volume fraction of vanadium carbide amounting to about 20% crystallises. This paper presents the results of studies on high-vanadium cast iron subjected to the inoculation treatment with magnesium master alloy. The aim of this operation is to change the morphology of the crystallising VC carbides from the fibrous shape into a spheroidal one. The study also examines the effect of the amount of the introduced inoculant on changes in the morphology of the crystallising VC carbides. To achieve the goals once set, metallographic studies were performed on high-vanadium cast iron of eutectic composition in base state and after the introduction of a variable content of the inoculant. The introduction of magnesium-based master alloy resulted in the expected changes of microstructure. The most beneficial effect was obtained with the introduction of 1.5% of magnesium master alloy, since nearly half of the crystallised vanadium carbides have acquired a spheroidal shape.
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Authors and Affiliations

M. Kawalec
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Abstract

The paper presents the results of tests on the spheroidising treatment of vanadium carbides VC done with magnesium master alloy and mischmetal. It has been proved that the introduction of magnesium master alloy to an Fe-C-V system of eutectic composition made 34% of carbides crystallise in the form of spheroids. Adding mischmetal to the base alloy melt caused 28% of the vanadium carbides crystallise as dendrites. In base alloy without the microstructure-modifying additives, vanadium carbides crystallised in the form of a branched fibrous eutectic skeleton. Testing of mechanical properties has proved that the spheroidising treatment of VC carbides in high-vanadium cast iron increases the tensile strength by about 60% and elongation 14 - 21 times, depending on the type of the spheroidising agent used. Tribological studies have shown that high-vanadium cast iron with eutectic, dendritic and spheroidal carbides has the abrasive wear resistance more than twice as high as the abrasion-resistant cast steel.

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Authors and Affiliations

M. Górny
M. Kawalec

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