Development of Liquefaction Technology 280X29NL to Increase the Strength and Brittleness of Castings

In this study, the impact of titanium (Ti) on low-alloy steel alloys is examined, focusing on the mechanical properties of the alloy with varying Ti content levels. Heat treatment was conducted to enhance the mechanical properties and performance indicators of the casting samples. The elemental volume distribution mapping and microstructure analysis of the research samples were performed using SEM - Carl Zeiss Ultra Plus Field Emission. Subsequently, the hardness and wear resistance characteristics of samples containing Ti contents of 0, 0.1, 0.3, 0.5, 0.8, and 1.1 were evaluated post heat treatment. Notably, steel samples containing 0.3% and 0.5% Ti, exhibiting structures of ferrite, martensite, and limited bainite, demonstrated superior hardness and wear resistance properties. Abrasive wear resistance tests were conducted using a specialized device with a horizontal diamond disc. The primary objective of this research is to introduce the developed technology for the rolling mill rolls at a prominent metal manufacturing enterprise in the republic, resulting in enhanced economic efficiency through increased production volume. Consequently, achieving a hardness of HB 323 and improving wear resistance by 1.2 times were notable outcomes of the study.

Section: Microstructurementioning

confidence: 92%

Effects of titanium (Ti) contents on the wear resistance of low-alloy steel alloys

Kholmirzaev,

Turakhodjaev,

Saidmakhamadov

et al. 2024

“…The lining experiences a high impact load, and the balls are chipped. Due to the small contact area of grinding media, the yield of the usable (71mkm) is 85 -89 % [7][8]. The experiments carried out at mills № 44 and № 57 at different loads, the material size class after unloading the mill and draining the HCI show that the yield of a suitable for lining with an existing chromium -molybdenum alloy structure increased to 96% (Table 1).…”

Section: Methodsmentioning

confidence: 99%

Improving the design of the lining of the ball mill used to improve the quality of grinding

Saidmakhamadov,

Turakhodjaev,

Tursunbaev

et al. 2024

This article discusses the traditional ball mill lining used and the improved ball mill lining. Experimental data of the proposed and previous linings are presented. The economic effect of using a new improved ball mill lining design is shown. Also, based on the dimensions of the ores, their mechanical properties, the material and construction of the detail were selected first. It is recommended to use high-manganese steel alloy, if corrosion occurs due to friction, and chromium – molybdenum steel alloy as the material of the detail. As a result of changing the design of the part in the proposed technology, it can be seen that the ore crushing process has improved. As a result of the good ore grinding process, it became easier to extract metals and alloys from the crushed ore. In order to obtain research results, several studies were conducted using traditional and improved technology. Thanks to this technology, the economic efficiency of the production enterprise has increased due to the improvement of ore crushing, the increase of the service life of the part, the saving of resource energy, and the reduction of the time required for technical repairs.

“…A material that contains bentonite as a binder for one-time molding compounds is montmorillonite. Another important aspect is that the increase in the amount of sand moisture leads to a decrease in gas permeability [1].…”

Section: Introductionmentioning

confidence: 99%

Improving the technology of obtaining highquality castings from steel in sand-clay molds

Kholmirzaev,

Khasanov,

Abdullayev

et al. 2024

This article examines the technology for producing high-quality steel and alloy castings in sand-clay molds. The optimization of the sandclay compound mold composition is explored, focusing on bentonite and kaolin clays as binders. The mold composition is refined based on the research conducted on these binding clays, resulting in the production of gas-free cast products. Additionally, the gas permeability of the sand-clay molds increased by 14-16%. The study also presents a test analysis of the gas permeability property, a crucial aspect of sand-clay mold quality. Furthermore, a mathematical model of the process was developed from the research findings to predict gas permeability values with varying amounts of binding clays, eliminating the need for further testing.