Projects information of the young scientists’ public financing for 2021-2023   


АР09058350 “Development and introduction of the production technology of chrome antifriction cast iron for parts of the mining equipment”, a research adviser Shcherbakova E.P.  

Topicality

A number of parts of the mining equipment are made from chrome cast iron. In spite of significant advantages of using this cast iron, it also has its disadvantages – relatively poor casting properties (low fluidity, high shrinkage), besides, machining is complicated, when making the parts from cast products.   

Project objective

Development and introduction of the parts’ production technology of mining equipment,  made from chrome cast iron with an optimal set of properties, depending on operation conditions of the parts, which will increase a life cycle by 1.5-2 times.

Expected and achieved results

The main technological parameters of manufacture of the dredge pumps’ parts and composition of the wear-resistant alloy were determined. The composition of the wear-resistant alloy was determined. The properties of developed alloy were studied in laboratory conditions.

It was discovered that microalloying with titanium up to 0.2% led to significant grinding a graphite phase and some increase of its amount that contributed to the increase of slip coefficient. The conducted experimental research confirmed a beneficial effect of microalloying with the titanium on operational properties of the antifriction gray cast iron “AChS-2”. The introduction of titanium into the composition of “AChS-2” alloy in the amount of 0.2% led to grinding the graphite phase that favourably affected the slip coefficient and hardness of the alloy.

The properties of the developed alloy were studied in laboratory conditions. Microstructures of the alloy, data of the mechanical properties of parts were obtained.

A made information analysis allowed to assume that microalloying with some elements would enable to grind and make the graphite phase more uniform in size. The following experiment was carried out for this purpose. An experimental alloy was smelted under laboratory conditions; the content of titanium was increased up to 0.2% in the experimental alloy, i.e. almost by 2 times in comparison with the composition of classical cast iron “AChS-2”. The required content of titanium was ensured by the introduction of ferrotitanium “FeT70”.

The presence of titanium had to contribute to graphite grinding and thus, indirectly affect the mechanical properties of cast iron, in particular the slip coefficient.

The alloy was smelted in the induction furnace “UIP-25”, casting was carried out in the sand-clay mold. Casting conditions did not change during the experiment. After complete cooling, samples were prepared to study a microstructure and mechanical properties. Thin sections were prepared at the metallographic complex “Strue”, the software “Thixomet Pro” was used for a metallographic analysis, hardness was determined at the hardness testing machine “Vilson”. The slip coefficient was determined at the device “COF-P01(M)” with the following characteristics: dry friction (without lubrication), angle of slope – 150; angular speed – 100/s. The basic alloy “AChS-2” was used as a sample for comparison.

The results of microstructure studying showed that the average length of graphite inclusions was 27 µm in the experimental alloy. The length of graphite inclusions decreased by 4 times in comparison with the basic alloy “AChS-2”. In addition, the area, occupied by the graphite, increased slightly, by about 10%, that indicated the increase of amount of the free graphite phase. The slip coefficient increased by 35% in the experimental alloy that indicated its higher antifriction properties, while the hardness of test sample increased slightly, by about 12%.

 

   
No. 1 No. 2
   
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No. 5

Microstructures of the studied samples No. 1-5

Research group

1. Shcherbakova Elena Petrovna – research adviser, PhD, acting associate professor of the Nanotechnology and Metallurgy Department

ORCID 0000-0001-6678-6673

Researcher ID N-5639-2017

Scopus Author ID 55543103900

2. Dostaeva Ardak Mukhamedievna – PhD, acting associate professor of the Nanotechnology and Metallurgy Department

ORCID 0000-0002-1982-2368

Researcher ID AAB-9478-2020

Scopus Author ID 57160297400

3. Issagulova Diana Aristotelevna – PhD, associate professor of the Nanotechnology and Metallurgy Department

Scopus Author ID 55778253200

4. Adamova Gulden Khassenovna – doctoral student of the group “METD-21” of the Nanotechnology and Metallurgy Department

5. Kovaleva Tatiana Viktorovna – doctoral student of the group “METD-19” of the Nanotechnology and Metallurgy Department

Scopus Author ID 57211297553

6. Aubakirov Dastan Rakhmetollaevich – doctoral student of the group “METD-19” of the Nanotechnology and Metallurgy Department

ORCID 0000-0003-4193-5956

Researcher ID X-1767-2019

Scopus Author ID 57194209750

7. Alina Araylym Altynbekovna – doctoral student of the group “METD-20” of the Nanotechnology and Metallurgy Department

ORCID 0000-0003-3577-4914

Scopus Author ID 57218196165

List of publications for 2022

1. Shcherbakova E.P., Kvon Sv. S., Kovalev P.V., Dostaeva A.M., Aubakirov D.R. Influence of alloying on the parameters of graphite inclusions and some properties of the gray cast iron // Works of the University, Karaganda: Publishing house of KTU. – 2022, No. 3, P. 68-72.

2. Kvon Sv. S., Shcherbakova E.P. Studying the properties of AChS-2, alloyed with titanium // Proceedings of the International Scientific and Practical Conference “Integration of Science, Education and Production – a basis for Implementation of the Plan of Nation” (Saginov readings No.14), dated June 16-17, 2022, P. 209-210.

3. E.P. Shcherbakova, Sv.S. Kvon, A.M. Dostaeva, D.R. Aubakirov Studying a graphite phase in the antifriction cast iron “AChS-2” // Metallurgy, Croatia: Croatian Metallurgical Society. – 2022. – No.1 (61). – P. 200-202 (IF Scopus 0,388, Scopus percentile – 37th).

Information for potential users

The obtained results can be realized in other technologies of foundry production, used in the development of new alloys, in the development of new modes of casting and melting. The obtained theoretical and practical results will be used in industry, engineering calculations and for educational purposes.

 

AP09058352 “Development and introduction of the new heat-resistant alloy and manufacturing technology of the parts for metallurgical production on its basis”, a research adviser Arinova S.K.    

Topicality

The topicality of this topic is premised on the need to search for new compositions of the heat-resistant steel, which are optimal in terms of price/quality. In other words, it is necessary to increase the heat resistance of existing and currently used heat-resistant steel with minimum increase of its prime cost. The problem is worsened by the fact that production of the heat-resistant steel is not almost organized in the Republic of Kazakhstan. Therefore, a developed alloy should not have a very complex composition, so that a technology of its production and cast products, made from it, can be adapted and introduced at the operating enterprises of the Republic of Kazakhstan, taking into account a level of the fixed assets development.

Project objective

Creation of the new improved heat-resistant alloys, as well as parts manufacturing technologies on their basis, taking into account the existing fixed assets on the territory of the Republic of Kazakhstan (Karaganda region).

Expected and achieved results

The modes of melting technology of the metallurgical equipment’s parts of experimental heat-resistant alloy have been developed and the choice of casting method for manufacture of the cast products from the developed alloy has been substantiated.

The casting method for manufacture of the cast products from the developed alloy has been substantiated and selected. It is proposed to use the alloy, based on the steel “1Х18N9Т”, which is additionally alloyed with Nb as the alloy.

It is proposed to use lost foam casting (LFC) as a casting method. The material of LFC model, its optimal composition for a selected casting method have been developed. It is proposed to use a mixture of the industrial and foundry polystyrene in the certain ratio and certain fraction.

The mode of technology of melting parts of the metallurgical equipment (grids of the sintering grates) from the experimental heat-resistant alloy has been developed. The basic system “Fe-Cr-Ni”, additionally alloyed with niobium, is used as an experimental alloy. The optimal amount of niobium, previously determined on a trial basis, initiates the formation of intermetallide of the NbMe type, initial presence of the titanium in the system enables to avoid an undesirable G-phase. Planning matrices have been calculated for further testing on the basis of laboratory research. A preliminary technological chart of the process has been developed on the basis of obtained results, according to which industrial tests have been carried out at the production site.

   
а
  Structure of the experimental alloy (b, magnification – 500) and MRSA of the interstitial phases (a)
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Research group  

  1. Arinova Sania Kaskataevna – research adviser, PhD, teacher of the Nanotechnology and Metallurgy Department

Scopus Author ID 57192206332

  1. Aubakirov Dastan Rakhmetollaevich – senior teacher of the Nanotechnology and Metallurgy Department

ORCID 0000-0003-4193-5956

Researcher ID X-1767-2019

Scopus ID 57194209750

  1. Sultangaziyev Ruslan Bauyrzhanovich – PhD, senior teacher of the Nanotechnology and Metallurgy Department

ORCID 0000-0002-3928-486X

Scopus Author ID 57160291200

  1. Issagulova Diana Aristotelevna – PhD, associate professor of the Nanotechnology and Metallurgy Department

Scopus Author ID 55778253200

  1. Kovaleva Tatiana Viktorovna – master, doctoral student of the Nanotechnology and Metallurgy Department

Scopus Author ID 57211297553

  1. Alina Araylym Altynbekovna – doctoral student of the group “METD-20” of the Nanotechnology and Metallurgy Department

ORCID 0000-0003-3577-4914

Scopus Author ID 57218196165

  1. Adamova Gulden Khassenovna – doctoral student of the group “METD-21” of the Nanotechnology and Metallurgy Department

List of publications for 2022

  1. S.K. Аrinova, Sv.S. Kvon, V.Yu. Kulikov, М.М. Abdildina, A.E. Omarova Thermodynamic modeling and analysis of the structure of heat-resistant alloys of the system “Fe-Cr-Ni” // Metallurgy, Croatia: Croatian Metallurgical Society. – 2022. – No.2 (62). – P. 341-343.
  2. Arinova S.K., Kvon Sv.S., Issagulova D.A., Kovaleva T.V., Aubakirov D.R. Prospects of usage and improvement of the heat-resistant steel for the manufacture of parts of the metallurgical production // Works of the University, Karaganda: Publishing house of KTU. – 2022. – No.1. – P. 41-45.
  3. Arinova S.K., Aubakirov D.R. The influence of alloying elements on a microstructure and heat resistance of the alloys // Proceedings of the International Scientific and Practical Conference “PROCEEDINGS OF ACADEMIC SCIENCE – 2022” No. XVIII (August 30 – September 07, 2022) – Sheffield, Volume 2. P.50-60.

Information for potential users

The obtained scientific results can be applied in the development of new production and areas of metallurgical and foundry production.

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