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Comparison of Microstructure and Mechanical Properties of Cast Steel Carried out on Cast-on Samples and Samples Cast Separately

B.E. Kalandyk Renata E. Zapała

Archives of Foundry Engineering | 2021 | vo. 21 | No 2 | 81-88 | DOI: 10.24425/afe.2021.136102

Keywords Mechanical properties Metallography Heat treatment Cast steel

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Abstract

The results of microstructure examinations and UTS, YS, El, RA carried out on low-carbon cast steel containing 0.15% C. The tests were carried out on specimens cut out from samples cast on a large-size casting and from samples cast in separate foundry moulds. It has been shown that significant differences in grain size observed in the material of the separately cast samples and cast-on samples occur only in the as-cast. In the as-cast state, in materials from different tests, both pearlite percent content in the structure and mean true interlamellar spacing remain unchanged. On the other hand, these parameters undergo significant changes in the materials after heat treatment. The mechanical properties (after normalization) of the cast-on sample of the tested cast steel were slightly inferior to the values obtained for the sample cast in a separate foundry mould. The microscopic examinations of the fracture micro-relief carried out by SEM showed the presence of numerous, small non-metallic inclusions, composed mainly of oxide-sulphides containing Mn, S, Al, Ca and O, occurring individually and in clusters.

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Authors and Affiliations

B.E. Kalandyk

Renata E. Zapała

e-mail:

ORCID:

AGH University of Science and Technology, Department of Cast Alloys and Composites Engineering, Faculty of Foundry Engineering, ul. Reymonta 23, 30-059 Krakow, Poland

Effect of Vanadium Microaddition on the Strength of Low-Carbon Cast Steel at Elevated Temperatures

B.E. Kalandyk Renata E. Zapała P. Pałka

Archives of Foundry Engineering | 2020 | vol. 20 | No 2 | 79-83 | DOI: 10.24425/afe.2020.131306

Keywords Low-carbon cast steel Microaddition elements Mechanical properties at elevated temperatures

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Abstract

The effect of vanadium microaddition on the strength of low-carbon cast steel containing 0.19% C used, among others, for castings of slag ladles was discussed. The tested cast steel was melted under laboratory conditions in a 30 kg capacity induction furnace. Mechanical tests were carried out at 700, 800 and 900°C using an Instron 5566 machine equipped with a heating oven of  2C stability. Non-standard 8- fold samples with a measuring length of 26 mm and a diameter of 3 mm were used for the tests. It has been shown that, compared to cast steel without vanadium microaddition, the introduction of vanadium in an amount of 0.12% to unalloyed, low carbon cast steel had a beneficial effect on the microstructure and properties of this steel not only at ambient temperature but also at elevated temperatures when it promoted an increase in UTS and YS. The highest strength values were obtained in the tested cast steel at 700C with UTS and YS reaching the values of 193 MPa and 187.7 MPa, respectively, against 125 MPa and 82.8 MPa, respectively, obtained without the addition of vanadium. It was also found that with increasing test temperature, the values of UTS and YS were decreasing. The lowest values of UTS and YS obtained at 900°C were 72 MPa and 59.5 MPa, respectively, against 69 MPa and 32.5 MPa, respectively, obtained without the addition of vanadium.

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Authors and Affiliations

B.E. Kalandyk

Renata E. Zapała

e-mail:

ORCID:

P. Pałka

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Comparison of Microstructure and Mechanical Properties of Cast Steel Carried out on Cast-on Samples and Samples Cast Separately

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Effect of Vanadium Microaddition on the Strength of Low-Carbon Cast Steel at Elevated Temperatures

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