Effects of the phase transformation in alloy structural steels at heating and cooling on their microstructure and impact resistance

Authors

  • I. F. Tkachenko State higher educational establishment "Priazovskyi state technical university", Mariupol, Ukraine
  • F. K. Tkachenko
  • K. I. Tkachenko
  • V. I. Miroshnichenko State higher educational establishment "Priazovskyi state technical university", Mariupol, Ukraine

DOI:

https://doi.org/10.31498/2225-6733.34.2017.105431

Keywords:

alloy structural steels, phase tranformations at heating and cooling, as cast structural state, as hot rolled condition, grain size, microstructure refinement, impact resistance

Abstract

The effects of the revealed phase transformation in alloy steels during isothermal soaking either at heating or cooling on theirs microstructures and impact resistance were experimentally investigated. The alloy Steel 35HML in as cast state as well as Steel E36 and Steel 30HGSA both in as hot rolled state were used for the research. Grain size refinement as well as elimination of the typical micro- and meso-structural nonuniformities, formed in the just crystallized and just hot deformed steels, was reached as a result of optimal isothermal soaking during the subsequent cooling. practically full restructuring of the initial steel states is shown for Steel E36 and Steel 35HML meanwhile in Steel 30HGSA visible microstructure changes do not take place under the above mentioned heat treatment conditions. Considerable, not less than 2 fold increase in impact resistance of Steel E36 and Steel 35HML is also reached as a result of optimal heat treatment, contrary to Steel 30HGSA where the resistance is practically constant. Formation of highly homogeneous microstructures but having however increased grain size is reached in Steel E36 and Steel 35HML after the proposed heat treatment, which includes isothermal soaking during austenitizing heating. The effects observed in the investigated steels as a result of the proposed heat treatment were explained in terms of the grain and dislocation subgrain boundary influences on chemical element diffusional redistribution between the structure components and new phase nucleation process. The specific behavior of Steel 30HGSA was attributed to the silicon influence on the above processes

Author Biographies

I. F. Tkachenko, State higher educational establishment "Priazovskyi state technical university", Mariupol

Доктор технічних наук, професор

F. K. Tkachenko

Доктор технічних наук

K. I. Tkachenko

Кандидат технічних наук

V. I. Miroshnichenko, State higher educational establishment "Priazovskyi state technical university", Mariupol

Асистент

References

Перелік використаних джерел (ГОСТ):

Some features of the heterogeneous diffusive nucleation and their use to form new type microstructures and eliminate chemical nonuniformities in bulk industrial product made of alloy structural steels : scientific work / І.F.Тkachenko, К.І. Тkachenko, V.І. Мiroshnichenko. – Свідоцтво № 68323 від 25.10.2016.

Вплив рівноважної дислокаційної субструктури на морфологію структурних складових при гетерогенних фазових перетвореннях у полікристалічних металевих сплавах / І.Ф.Ткаченко та ін. // Вісник Приазовського державного технічного університету : Зб. наук. праць / ДВНЗ «ПДТУ». – Маріуполь. – 2016. – Вип. 33. – С. 50-57.

Howe A.A. Ultrafine grained steels: industrial prospects / A.A. Howe // Material Science and Technology Series. – 2000. –№ 16. – P. 1264-1266.

Furuhara T. Grain boundary engineering for superplasticity in steels / T. Furuhara, T. Maki // Journal of Material Science. – 2005. – № 40. – P. 919-926.

Superplasticity of ultrafine grained low-alloy steels / S. Fernandez [et al.] // Memoria de Trabajos de Difusion Cientifica y Tecnica. – 2012. – № 10. – P. 45-56.

Ткаченко И.Ф. Об особенностях образования аустенита при нагреве легированных ста-лей / И.Ф. Ткаченко, К.И. Ткаченко // Вісник Приазовського державного технічного університету : Зб. наук. праць / ПДТУ. – Маріуполь. – 2002. – Вип. 12. – С. 25-27.

References:

Tkachenko I.F., Тkachenko К.І., Мiroshnichenko V.І. Scientific work «Some features of the heterogeneous diffusive nucleation and their use to form new type microstructures and eliminate chemical nonuniformities in bulk industrial product made of alloy structural steels». Certificate about registration no. 68903, 2016. (Eng.)

Tkachenko I.F., Tkachenko F.K., Tkachenko K.I., Miroshnichenko V.I. Vpliv rіvnovazhnoї dislokatsіinoї substrukturi na morfologіiu strukturnikh skladovikh pri geterogennikh fazovikh peretvorenniakh u polіkristalіchnikh metalevikh splavakh [Influence of the equilibrium dislocation substructure on the structure component morphology during the heterogeneous phase transformations in polycrystalline metallic alloys]. Vіsnik Priazovs'kogo derzhavnogo tekhnіchnogo unіversitetu – Reporter of Priazovskiy State Technical University, 2016, no. 33, pp. 50-57. (Ukr.)

Howe A.A. Ultrafine grained steels: industrial prospects. Material Science and Technology Series, 2000, no. 16, pp. 1264-1266. (Eng.)

Furuhara T., Maki T. Grain boundary engineering for superplasticity in steels. Journal of Material Science, 2005, no. 40, pp. 919-926. (Eng.)

Fernandez S., Quintana M., García J., Verdeja L., González R., Verdeja J. Superplasticity of ultrafine grained low-alloy steels. Memoria de Trabajos de Difusion Cientifica y Tecnica, 2012, no. 10, pp. 45-56. (Eng.)

Tkachenko I.F., Тkachenko К.І. Ob osobennostiakh obrazovaniia austenita pri nagreve legirovannykh stalei [Some features of the austenite formation at alloy steel heating]. Vіsnik Priazovs'kogo derzhavnogo tekhnіchnogo unіversitetu – Reporter of Priazovskiy State Technical University, 2002, no. 12, pp. 25-27. (Rus.)

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How to Cite

Tkachenko, I. F., Tkachenko, F. K., Tkachenko, K. I., & Miroshnichenko, V. I. (2017). Effects of the phase transformation in alloy structural steels at heating and cooling on their microstructure and impact resistance. Reporter of the Priazovskyi State Technical University. Section: Technical Sciences, (34), 18–23. https://doi.org/10.31498/2225-6733.34.2017.105431

Issue

No. 34 (2017): Reporter of the Priazovskyi State Technical University. Section: Technical sciences

Section

Materials science

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