Temper brittleness of die 4Kh4N5М4F2 steel

Keywords

steel, heat treatment, phase composition, crystal structure, mechanical properties.

Cite as

Sydorchuk O. M., Gogaev K. O., Radchenko О. K., Geybat oglu Askerov M., and Bondarchuk V. I. Temper brittleness of die 4Kh4N5М4F2 steel. Physicochemical Mechanics of Materials. 2023. 59(5), 125-128.

https://doi.org/10.15407/pcmm2023.05.125

Abstract

Heat-treated 4Kh4N5М4F2 steel with adjustable austenitic transformation during operation was studied. The temperature range (450–500°С) in which the tempering brittleness of this steel was manifested was established. The impact toughness of the samples after different tempering temperatures and after steel hardening from 1100°С was determined and it was shown that after tempering at 475°С the minimum value of the impact toughness at room temperature (15 J/cm²) was reached. The role of Ni as a Fe_1-xNi_x replacement element was analyzed, and the segregation along the grain boundaries of the Me₆C  carbide phase in the solid solution, which caused a decrease in the impact toughness and an increase in the steel brittleness, was recorded.

References

1. Ya. A. Kril, E. S. Gevorkian, and D. L. Lutsak, Materials Science. Steel: Classification, Production, Consumption, Marking [in Ukrainian], Novyi Svit-2000, Lviv (2014).
2. L. A. Pozniak, Tool Steels [in Russian], Naukova Dumka, Kyiv (1996).
3. M. H. Perepiolkina, and V. Ya. Grabovskyi, Effective alloying selection of new die steels with austenitic transformation during maintenance,” New Mater. and Techn. in Metall. and Mech. Eng. [in Ukrainian], Is. 1, 11-15 (2016).
4. S. E. Kondratiuk, M. V. Kindrachuk, and V. O. Stepanenko, Metallurgy and Processing of Metals [in Ukrainian], Victoria, Kyiv (2000).
5. O. I. Bykov, O. M. Sydorchuk, L. A. Myroniuk, D. V. Myroniuk, H. L. Shvedova, V. P. Konoval, S. F. Korichev, and A. P. Pozniy, “X-Ray Analysis of Features Formation of Both Crystalline Structure of Main Phases and Properties of 4Kh4N5M4F2 Steel (RATE Steel) at Handling,” Metallofizika i Noveishie Tekhnologii, 43, Is. 11, 1523-1536 (2021). https://doi.org/10.15407/mfint.43.11.1523