Changes in the state of sulfides and impact toughness of the quenched 40KhGM steel upon heat treatment in the austenitic region |
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| Authors: | D. A. Mirzaev N. I. Vorob’ev I. L. Yakovleva O. K. Tokovoi D. V. Shaburov E. A. Fominykh O. V. Samoilova |
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| Affiliation: | (1) South-Ural State University, pr. V.I. Lenina 76, Chelyabinsk, 454080, Russia;(2) OAO Chelyabinsk Metallurgical Integrated Works, ul. Vtoraya Paveletskaya 14, Chelyabinsk, 454047, Russia;(3) Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Ekaterinburg, 620041, Russia |
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| Abstract: | The impact toughness of the quenched 40KhGM steel has been investigated as a function of the heat treatment conditions in the austenitic region. The maximum impact toughness was observed after heating to 1300°C, intermediate annealing at 1050°C, and quenching with low-temperature tempering. According to the results of the fractographic and electron-microscopic examinations, the high impact toughness is due to the specific type of the manganese sulfide precipitation from the γ solid solution. The results of a theoretical estimation of the average sulfur solubility in the γ solid solution are presented. |
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