Conclusions
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1.
The plasticity of pearlitic steel in a single loading in a direction perpendicular to the rolling direction strongly depends upon the accumulation of nonmetallic inclusions.
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2.
In the transition from the brittle to the ductile mechanism of fracture together with accumulations of Fe−Mn sulfides the role of accumulations of oxide inclusions increases.
-
3.
The greatest contribution to the anisotropy of the properties of the investigated heats of steel is made by accumulations of Fe−Mn sulfides, next by accumulations of plastic aluminosilicates, and finally by alumina stringers.
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4.
To increase the plasticity of pearlitic steel in loading in a direction perpendicular to the rolling direction it is necessary to obtain the maximum uniformity in distribution of the nonmetallic inclusions in the steel and not to just decrease the content of them.
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5.
It is desirable to develop a method of determination of the nonuniformity of nonmetallic inclusion distribution on polished specimens, which would make it possible to predict the properties of the steel without fractographic analysis of the inclusions.
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6.
The instability in the properties of steels deoxidized with the Si−V−Ca deoxidizer may be explained by the fact that as the result of the differing calcium content the formation of both plastic and brittle aluminosilicates is possible and consequently the transformation of manganese sulfides of the third type to sulfides of the second type is possible.
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7.
Of all of the investigated deoxidizers deoxidation with Si−Mg−Ti deoxidizer has the most favorable influence on the properties of the steel. The same properties are obtained in deoxidizing with Si−V−Ca deoxidizer with the condition that the simultaneous formation of brittle silicates and sulfides of the third type is provided.
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 6, pp. 19–26, June, 1985.
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Budnitskii, G.G., Velikanov, A.V., Kiseleva, T.N. et al. Influence of accumulations of nonmetallic inclusions on the static failure of pearlitic steel. Met Sci Heat Treat 27, 416–425 (1985). https://doi.org/10.1007/BF00693280
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DOI: https://doi.org/10.1007/BF00693280