Conclusions
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1.
An increase in carbon content from 0.8 to 1.2% in cast steels causes formation of chromium-containing boride and carboboride phases.
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2.
With an increase in carbon content in steels the microhardness of structural components changes a little.
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3.
The maximum hardness is exhibited by steel oil quenched from 1000–1000°C.
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4.
Steels with 0.82–1.20% C has the greatest thermal stability (up to 900°C). In steels with 0.15–0.39% C with heating up to 900°C a marked reduction in hardness is observed.
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Literature cited
I. M. Spiridonova, O. G. Lysenko, and S. B. Pilyaeva, "Study of the inhomogeneity of flat-faced crystals in the systems Fe−B and Fe−B−C," in: Questions of Forming a Metastable Structure for Alloys: Coll. Works [in Russian], Dnepropetrovsk (1984).
I. M. Spiridonova, "Structure and properties of iron-boron-carbon alloys," Metalloved. Term. Obrab. Met., No. 2, 58–61 (1984).
Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 61–64, May, 1989.
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Egorov, M.D., Sapozhnikov, Y.L. & Shakhnazarov, Y.V. Effect of carbon content on the structure, hardness, and thermal stability of boron-chromium cast steels. Met Sci Heat Treat 31, 387–391 (1989). https://doi.org/10.1007/BF00801664
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DOI: https://doi.org/10.1007/BF00801664