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Inoculation of Austenite Primary Grains in Cast Iron

Kopyciński D., Guzik E., Szczęsny J., Dorula J., Siekaniec D., Ronduda M.

Archives of Foundry Engineering

2014

Vol. 14, iss. 4

45--48

The modification is a widespread method of improving the strength properties of cast iron. The impact in terms of increasing amounts of eutectic grains has been thoroughly studied while the issue of the impact on the mechanical properties of primary austenite grains has not been studied in depth yet. The paper presents the study of both aspects. The methodology was to conduct the melting cast iron with flake graphite, then modifying the alloy by two sets of modifiers: the commercial modifier, and a mixture of iron powder with a commercial inoculant. The DAAS test was carried out to identify the primary austenite grains. The degree of supercooling was determined and the UTS test was performed as well. Additionally carried out the metallographic specimen allowing for counting grains. It can be concluded that the introduction of the iron powder significantly improved the number of austenite primary grains which resulted in an increase in tensile strength UTS.

Primary austenite grain size evaluationin TRIP steels

Žáček O., Pleštilová G., Kliber J.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2005

z. 86

211-216

Primary austenite grain size in samples made of three experimental TRIP steels were evaluated in this work. All three TRIP steels samples were heated up to 1000°C, 1100°C and 1200°C and subsequently quenched. Various ways of etching for primary austenite grain were ušed to describe and evaluate primary austenite grain size.