The influence of operating conditions on the structure and mechanical properties of 4Х4Н5М4Ф2 die steel

Keywords

die steel, thermodeformation and heat treatments, phase composition, crystal structure, mechanical properties.

Cite as

Gogaev K. O., Sydorchuk O. M., Myslyvchenko O. M., Yevych Y. I., and Hongguang Ye. The influence of operating conditions on the structure and mechanical properties of 4Х4Н5М4Ф2 die steel. Physicochemical Mechanics of Materials. 2023. 59(2), 36-40.

https://doi.org/10.15407/pcmm2023.02.036

Abstract

The structure and mechanical properties of 4Х4Н5М4Ф2 steel in heat-deformed and cast states after quenching and tempering, as well as additional heating are investigated. It is shown that after additional heating of hardened and tempered 4Х4Н5М4Ф2 steel, which models the operating conditions of the equipment (operating temperature during quasi-stationary exposure), its weakening occurs at 630-650°С, which is associated with the formation of М₇С₃ carbides. Cast steel under these condi­tions does not have such a carbide phase in the metal structure, which is the cause of an increase in its heat resistance. The expansion of the operating temperature range of cast 4Х4Н5М4Ф2 steel after the optimal mode of hardening and tempering allows us to use a tool made of this steel up to an operating temperature of 650°С. It is recommended not to use such steel in the cast and heat-deformed states for the manufacture of a tool for hot deformation of non-ferrous metals and alloys, which operates under conditions of cyclic impact loading.

References

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