Ural Federal University (Ekaterinburg, Russia):

I. I. Sinitsyn, Post-graduate, Dept. of Physics, Institute of Fundamental education, e-mail: n.i.sinitsyn@urfu.ru
O. A. Chikova, Dr. Phys.-Math., Prof., Dept. of Physics, Institute of Fundamental education, e-mail: O.A.Chikova@urfu.ru
D. S. Chezganov, Cand. Phys.-Math., Senior Researcher, Dept. of Optoelectronics and Semiconductors Technology, Institute of Natural Science and Mathematics, e-mail: chezganov.dmitry@urfu.ru

The results of a comparative study of the microstructure and crystalline structure of 110G13L steel ingots (Hadfield steel), crystallized after heating to 1450 °С and 1630 °С, are presented. Hadfield steel is known for its high hardness, wear resistance and is characterized by a content of 0.95–1.50 wt.% carbon and 11.5–15.0 wt.% manganese. Previously, the authors found then heating of the 110G13L liquid steel to a temperature above 1630 °C leads to the destruction of microheterogeneity and changes the conditions for crystallization of metal. Microheterogeneity is understood to mean the presence of dispersed particles enriched in manganese in liquid steel, which are suspended in the environment of a diff erent composition and separated from it by a interfacial surface. The destruction of microheterogeneous state of the melt occurs when it is heated above a certain temperature — in case of liquid steel 110G13L to a temperature of 1500 °C. The relationship between destruction of the microheterogeneous state of the liquid steel 110G13L and the changes of microstructure and crystalline structure of cast metal we investigated. Microstructure of Hadfi eld steel ingots is represented by dendrites of austenite; the interdendritic space is filled with a ferritic-pearlitic mixture with carbides, oxides, phosphites and sulfites. Destruction of microheterogeneity of the melt led to changes in microstructure of ingot: carbides and signs of disintegration of austenite are absent at boundaries of dendrites, and porosity of ingot increases. Destruction of microheterogeneity during subsequent cooling and crystallization also caused chemical heterogeneity of dendrites austenite over manganese. Destruction of microheterogeneity of the melt led to changes in crystal structure of ingot: the proportion of low-angle grain boundaries increased, the value of local mechanical stresses decreased, which should lead to an increase in ductility and corrosion resistance of metal.
The work was performed using the equipment of the “Modern Nanotechnologies” UCSU of the Ural Federal University. The study was carried out with the financial support of the RFBR in the framework of the scientific project No. 19-33-90198.

1. Lin P., Palumbo G., Erb U., Aust K. T. Influence of grain-boundary-character-distribution on sensitization and intergranular corrosion of alloy-600. Scripta metallurgica materialia. 1995. Vol. 33. pp. 1387–1392.
2. Palumbo J., King P. J., Aust K. T. et al. Grain-boundary design and control for inergranular stress-corrosion resistance. Scripta metallurgica materialia. 1991. Vol. 25, Iss. 8. pp. 1775–1780.
3. Vdovin К. N., Feoktistov N. А., Gorlenko D. А., Koptseva N. V. Wear of high-manganese steel castings. Chernye Metally. 2018. No. 9. pp. 48–53.
4. Herbig М., Liebscher Ch., Scheu Ch., Hickel Т. Light high-strength manganese steel: the progress through atomic understanding. Chernye Metally. 2018. No. 12. pp . 64–65.
5. Kolokoltsev V. M., Vdovin K. N., Gorlenko D. A., Gulin A. E. Calculation of stacking fault energy and its influence on abrasive wear resistance of Hadfi eld cast steel cooled at different rates. CIS Iron and Steel Review. 2016. Vol. 11. pp. 35–40.
6. Vdovin K. N., Gorlenko D. A., Feoktistov N. A., Dubrovin V. K. Study of the effect of complex alloying of high-manganese steel by Ti–Ca–N alloying composition on its microstructure, mechanical and operating properties. CIS Iron and Steel Review. 2017. Vol. 13. pp. 17–23.
7. Vdovin K. N., Feoktistov N. A., Gorlenko D. A., Nikitenko O. A. Investigation of microstructure of high-manganese steel, modified by ultra-dispersed powders, on the base of compounds of refractory metals. CIS Iron and Steel Review. 2017. Vol. 14. P. 34–40.
8. Kveglis L. I., Noskov F. M., Kazantseva V. V. et al. Fe–Mn–C alloys with anomalous volume of crystal lattice. Bulletin of the Russian Academy of Sciences. Physical series. 2008. Vol. 72. No. 8. pp. 1169–1171.
9. Sinitsky Е. V., Nefedev А. А., Akhmetova А. А. et. al. Review of research results aimed at improving the properties of high manganese steel castings. Teoriya i tekhnologiya metallurgicheskogo proizvodstva. 2016. No. 2. pp. 45–57.
10. Ten E. B., Likholobov Е. Yu. Improvement of the technology of 110G13L steel smelting by controlling oxidation of its melt. Liteyshchik Rossii. 2011. No. 12. pp. 12–14.
11. Vdovin K. N., Feoktistov N. А., Gorlenko D. А. et. al. Investigation of the effect of the 110G13L steel grade crystallization process on its properties. Liteynye prozessy. 2015. No. 14. pp. 29–36.
12. Budanov Е. N. Production of 110G13L steel castings by vacuumfi lm molding technology. Liteynoe proizvodstvo. 2014. No. 9. pp. 28–31.
13. Chikova O. A., Sinitsin N. I., V’yukhinV. V. Parameters of the Microheterogeneous Structure of 110G13L Liquid Steel. Russian Journal of Physical Chemistry A. 2019. Vol. 93, Iss. 8. pp. 1435–1442.
14. Sabzi M., Far S. M., Dezfuli S. M. Effect of melting temperature on microstructural evolutions, behavior and corrosion morphology of Hadfield austenitic manganese steel in the casting process. International Journal of Minerals, Metallurgy and Materials. 2018. Vol. 25, Iss. 12. pp. 1431–1438.
15. Chezganov D. S., Chikova O. A., Borovykh M. A. Effect of heat treatment on the crystal structure of deformed samples of chromium–manganese steel. Physics of Metals and Metallography. 2017. Vol. 118. No. 9. pp. 857–863.
16. Harzallah R., Mouftiez A., Felder E., Hariri S., Maujean J.-P. Rolling contact fatigue of Hadfield steel X120Mn12. Wear. 2010. Vol. 269. No. 9-10. pp. 647–654.
17. Feng X., Zhang F., Zheng C., Lü B. Micromechanics behavior of fatigue cracks in Hadfi eld steel railway crossing. Science China Technological Sciences. 2013. Vol. 56, Iss. 5. pp. 1151–1154.
18. Wang X.-J., Sun X.-J., Song C. et al. Grain Size-Dependent Mechanical Properties of a High-Manganese Austenitic Steel. Acta Metallurgica Sinica (English Letters). 2019. Vol. 32. No. 6. pp. 746–754.
19. Machado P. C., Pereira J. I., Penagos J. J. et al. The effect of in-service work hardening and crystallographic orientation on the microscratch wear of Hadfield steel. Wear. 2017. Vol. 376–377. Part B. pp. 1064–1073.
20. Li Y., Gu D. Parametric analysis of thermal behavior during selective laser melting additive manufacturing of aluminum alloy powder. Materials and Design. 2014. Vol. 63. pp. 856–867.
21. Mouralova K., Benes L., Bednar J. et al. Using a DoE for a comprehensive analysis of the surface quality and cutting speed in WEDmachined hadfield steel. Journal of Mechanical Science and Technology. 2019. Vol. 33, Iss. 5. pp. 2371–2386.
22. Gorlenko D., Vdovin K., Feoktistov N. Mechanisms of cast structure and stressed state formation in Hadfield steel. China Foundry. 2016. Vol. 13. No. 6. pp. 433–442.