Conclusions
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1.
Investigations of Kh16N15M3B steel with different grain sizes and different Nb/C ratios at 550–950°C showed that large grained materials have a higher resistance to prolonged exposure to high temperatures. The grain size begins to influence the strength of the steel at temperatures above 600°C.
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2.
The prolonged ductility of Kh16N15M3B steel depends on the grain size, particularly in the commercial batches of the steel.
The greatest decrease in ductility occurs during the initial stages of deformational aging.
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3.
An increase in the Nb/C ratio decreases the prolonged resistance and prolonged ductility during exposure to high temperatures and also decreases the plasticity and the impact strength at room temperature. However, with increasing Nb/C ratios the deformation capacity not only decreases but also (after a certain time) increases.
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Literature Cited
A. M. Parshin and I. E. Kolosov, Investigation of Heat Resistant Alloys, Vol. 8 [in Russian], Izd. AN SSSR (1962).
K. Bungart and H. Sychrovsky, Stahl und Eisen,1, No. 13 (1954).
A. M. Parshin, Col.: Metal Science [in Russian], No. 6, Sudpromgiz (1962).
A. M. Parshin, Col.: Metal Science [in Russian], No. 4, Sudpromgiz (1960).
Additional information
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 3, pp. 49–53, March, 1966
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Parshin, A.M., Kolosov, I.E. Influence of the grain size and the Nb/C ratio on the properties of Kh16N15M3B steel. Met Sci Heat Treat 8, 226–229 (1966). https://doi.org/10.1007/BF00660394
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DOI: https://doi.org/10.1007/BF00660394