Науковий вісник НГУ

Graphitizing modification of the axial zone of cast iron rolling rolls in the liquidus-solidus temperature range

• 
• 

User Rating:  / 0

PoorBest 

Details

Category: Content №1 2023

Last Updated on 25 February 2023

Published on 30 November -0001

Hits: 3373

Authors:

V.E.Khrychikov*, orcid.org/0000-0002-8557-098X, Ukrainian State University of Science and Technologies, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

H.V.Meniailo, orcid.org/0000-0002-6874-7202, Ukrainian State University of Science and Technologies, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

O.D.Semenov, orcid.org/0000-0002-2339-5856, Ukrainian State University of Science and Technologies, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Y.G.Aftandiliants, orcid.org/0000-0001-5864-9855, National University of Life and Environmental Sciences of Ukraine, Kyiv, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

S.V.Gnyloskurenko, orcid.org/0000-0003-0201-7191, Physico-technological Institute of Metals and Alloys of the National Academy of Science of Ukraine, Kyiv, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

* Corresponding author e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

повний текст / full article

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2023, (1): 067 - 073

https://doi.org/10.33271/nvngu/2023-1/067

Abstract:

Purpose. To develop a method for calculating a process of graphitizing modification of unsolidificated liquid-solid zone to reduce transcrystallinity of the macrostructure and the amount of cementite in the center of castings.

Methodology. The duration of solidification of the castings was determined by the kinetic curves of liquidus, solidus and pouring boundary in coordinates of relative thickness of the solidified metal layer – the parametric criterion of Gulyaev.

Findings. A methodology for the process of modification of the axial zone of rolling was developed, the mass and time of adding aluminum were determined according to the amount of liquid-solid phase that remains after the solidification of the working layer. On the example of a rolling roll weighing 1115 kg, 0.488 kg of aluminum was added into liquid-solid zone after the working layer solidified. Movement of aluminum to the front of crystallization is provided by centrifugal forces and adding of aluminum along the height of the roll.

Originality. For the first time, the kinetic curves of liquidus, solidus and pouring boundary have been plotted in coordinates of the relative thickness of the solidified metal layer x/R and /R² – the parametric criterion of Gulyaev for rolled cast iron alloys cooled in chill-sand molds of various sizes. A methodology was developed for calculating the process of aluminum modification of the axial zone of rolling rolls after solidification of the working layer in the barrel which was set at the pouring boundary. The amount of aluminum depends on the remains of the liquid-solid phase.

Practical value. Graphitizing modification reduces transcrystallinity of the macrostructure and the amount of cementite in the axial zone of castings. A promising direction for further development is the development of new methods for manufacturing castings due to physical and mechanical effects on the two-phase zone, deoxidation and alloying of the central zones of castings.

Keywords: cast iron, modifications, rolling rolls, hardening, chill-sand mixture

References.

1. Skoblo, T. S., Klochko, O. Yu., Belkyn, E. L., & Sidashenko, A. I. (2018). New Approaches in Study of Inhomogeneity of Heterogeneous Structures. Metallofizika i Noveishie Tekhnologii, 40(2), 255-280. https://doi.org/10.15407/mfint.40.02.0255.

2. Fesenko, E. V., Mogylatenko, V. G., Fesenko, A. N., Kosyach­kov, V. A., & Fesenko, M. A. (2015). Manufacture of two-layers and double-sided iron castings with differential structure and properties. “EUREKA: Physical Sciences and Engineering”, (1), 55-59. Retrieved from https://foundry.kpi.ua/wpcontent/uploads/2020/03/maksym_fesenko.pdf.

3. Yamshinskij, M., Fedorov, G., & Verkhovliuk, A. (2016). The development of new casting alloys intended for operation under extreme conditions and some techniques of making castings from them. “EUREKA: Physical Sciences and Engineering”, (2(3)), 51-60. Retrieved from https://foundry.kpi.ua/wp-content/uploads/2020/03/33-175-1-pb.pdf.

4. Movchan, O. V., & Chernoivanenko, R. O. (2019). Phase and Structural Transformations of High-Carbon Alloy of the Fe–V–C System During Chemical-Thermal Processing and Deformation. Metallofizika i Noveishie Tekhnologii, 41(2), 251-261. https://doi.org/10.15407/mfint.41.02.0251.

5. Yakym, R. S., & Petryna, D. Yu. (2020). Analysis of Causes and Preventing Ways of Early Workability Loss of Three-Cone Rock Bit Cutters. Metallofizika i Noveishie Tekhnologii, 42(5), 731-751. https://doi.org/10.15407/mfint.42.05.0731.

6. Stefanescu, D. M., & Ruxanda, R. (2017). The Liquid State and Principles of Solidification of Cast Iron. In ASM Handbook, (Vol. 1A), Cast Iron Science and Technology. The Ohio State University and The University of Alabama. Emerson Climate Technologies, (pp. 46-58). Retrieved from https://www.asminternational.org/documents/10192/22533690/05924G_SampleArticle.pdf/1aef72fd-eb5f-094d-7450-c9c7b7bbe90c.

7. Kostryzhev, A. G., Slater, C. D., Marenych, O. O., & Davis, C. L. (2016). Effect of solidification rate on microstructure evolution in dual phase microalloyed steel. Scientific Reports, 6, 1-7. https://doi. org/10.1038/srep35715.

8. TU U 28.9-00187375-106:2018 (2018). Cast iron and steel rolls for hot rolling of metals. Dnipro: Dnipropetrovsk Rolling Mill Plant. Retrieved from https://nmetau.edu.ua/file/ty_y_28.9-00187375-106-2018_rollers_cast_iron_and_steel.pdf.

9. Khrychikov, V. E., Meniailo, H. V., & Semenov, A. D. (2018). Influence of solidification processes on the distribution of magnesium sulfides and the macrostructure of ductile iron castings. Metallurgical and mining industry, (1), 18-27. Retrieved from https://www.metaljournal.com.ua/1-310-2018/.

10. Hitko, O. Yu., Ivanova, L. Kh., & Khrychykov, V. E. (2021). Modifier for in-form modification of the axial zone of rolling rolls. Theory and practice of metallurgy, (3), 26-30. https://doi.org/1034185/tpm.3.2021.04.

11. Fesenko, M. A., & Fesenko, A. M. (2020). In-mould graphitizing, spheroidizing, and carbide stabilizing inoculation of cast iron melt. Progress in Physics of Metals, 21(1), 83-101. https://doi.org/10.15407/ufm.21.01.083.

12. Ciesielski, M., & Mochnacki, B. (2019). Comparison of approaches to the numerical modelling of pure metals solidification using the control volume method. International Journal of Cast Metals Research, 32(4), 213-220. https://doi.org/10.1080/13640461.2019.1607650.

13. Moumeni Elham (2013). Solidification of cast iron - A study on the effect of microalloy elements on cast iron. Technical University of Denmark. Denmark: Department of Mechanical Engineering. Retrieved from https://backend.orbit.dtu.dk/ws/portalfiles/portal/77801669/Elham_Moumeni_Thesis. pdf.

14. Khrychikov, V. E., & Menyailo, E. V. (2011). Temperature Patterns and Pouring Limits of High-Strength Cast Iron during Solidification in the Combined Chill-Sandy Mold Box. Metallurgical and Mining Industry, 3(2), 39-43. Retrieved from https://www.metaljournal.com.ua/assets/Uploads/attachments/Khrychikov39.pdf.

15. Lukianenko, I. V., Fesenko, M. A., Kosiachkov, V. O., & Fesenko, E. V. (2016). The time factor in the spheroidizing and grafitizing modification and cast iron cristallization. International scientific journal. “Materials science. Non-equilibrium phase transformations”, (2), 25-29.

• < Prev
• Next >