Changes in the state of sulfides and impact toughness of the quenched 40KhGM steel upon heat treatment in the austenitic region

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. Accordin...

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Published inPhysics of metals and metallography Vol. 103; no. 5; pp. 499 - 506
Main Authors Mirzaev, D. A., Vorob’ev, N. I., Yakovleva, I. L., Tokovoi, O. K., Shaburov, D. V., Fominykh, E. A., Samoilova, O. V.
Format Journal Article
LanguageEnglish
Published Moscow Springer Nature B.V 01.05.2007
Subjects
Chemical precipitation
Heat treating
Heat treatment
Impact strength
Low temperature
Manganese
Metallurgy
Quenching
Solid solutions
Steel
Structural steels
Toughness
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Summary: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.
ISSN:0031-918X
1555-6190
DOI:10.1134/S0031918X07050109