Conclusions
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1.
An investigation of the kinetics of hydrogen precipitation from large steel forgings with use of the theory of heat transfer showed that the hydrogen concentration in the center of large forgings changes negligibly after annealing.
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2.
Redistribution of hydrogen between the metal and voids has a large effect on the formation of shattercracks. Hydrogen is found in the solid solution in the process of annealing with isothermal holding and at higher temperatures. At low temperatures, especially at room temperature, almost all the hydrogen is in equilibrium in voids.
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3.
During isothermal holding the hydrogen diffuses to the surface of voids. During supercooling and in the process of final cooling it precipitates in voids, molecular hydrogen is formed, and the steel becomes resistant to formation of shattercracks.
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Additional information
Central Scientific-Research Institute of Heavy Machine Construction. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 9, pp. 2–6, September, 1978.
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Astaf'ev, A.A. Preliminary heat treatment of forgings. Met Sci Heat Treat 20, 695–699 (1978). https://doi.org/10.1007/BF00703745
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DOI: https://doi.org/10.1007/BF00703745