A deformation mode in a cold rolling condition to provide the necessary texture of the Ti-3Al-2.5V alloy

Пилипенко, С. В.; Grigorenko, V. U.; Козечко, В.А.; Bohdanov, O. O.

doi:10.33271/nvngu/2021-1/078

Cited by 6 publications

(4 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Scientists from different countries constantly pay attention to the research on cold rolling of seamless pipes. This, first of all, concerns changes in microstructures [8,9] during cold rolling of seamless stainless steel pipes, the ratio of deforma tions on the wall and on the diameter of the pipe (Qfactor) [3], the creation of nanostructures on the inner surface of pipes [10], improved tubesshells of nuclear fuel [11,12], cre ation of new types of microstructures [13], highenergy pro cessing of metals [14]. This is related to the problems of increasing the perfor mance of pipes in various units of responsible purpose.…”

Section: Tablementioning

confidence: 99%

“…Cold pilger rolling of pipes is applied both for use in the produc tion of pipes from corrosionresistant steels, titaniumbased al loys [1] and in the production of pipes from carbon grades of steel. Research is conducted with the aim of improving produc tion technologies to ensure the regulated norms and standards of requirements for pipe accuracy [2] and microstructure [3]. Foreign researchers are also engaged in similar issues [4,5].…”

mentioning

confidence: 99%

See 1 more Smart Citation

Microstructures and mechanical properties of cold rolled pipes with increased small deformation

Holovchenko,

Grigorenko,

Protsiv

2023

Nauk. visn. nat. hirn. univ.

View full text Add to dashboard Cite

Purpose. Experimental study on microstructure, mechanical properties of pipe diversity on a new type of cold rolling pipe, which has the ability to perform different modes of supply and rotation. Methodology. Research method is an experimental one on modern industrial equipment using modern devices. The study was conducted when rolling pipes made of steel 08Cr18Mn10Ti on the CRP 6-20 mills. Rolling route is often 25 × 2.5 mm ® 16 × 1.5 mm, which is often used in production. Rolling was carried out on the CRP 6-20 mills in four modes of feed and rotation: mode 1 – feed is performed before the forward stroke, and rotation before the return stroke of the stand; mode 2 – the feed is performed before the forward stroke, and the rotation before the forward and reverse stroke of the stand; mode 3 – feeding is performed in the front and rear position of the stand and rotation in the rear position of the stand; mode 4 – feed and turn are performed before the forward and reverse of the stand. Findings. Metallographic studies on microstructures showed that for mode 1, the grain size on the outer surface of the pipes is less than on the inner surface. The difference reaches the value of 1–2 points. For mode 4, the opposite is true. The size of the grains on the outer surface of the pipes is larger than on the inner surface. The difference reaches the value of 1–2 points. This can be explained by the fact that in mode 1 most of the compression is performed in the forward stroke rather than in reverse stroke. And in mode 4, these crimps are close in value and smaller than in a forward stroke in mode 2. Originality. New experimental industrial data have been obtained for the first time on the state-of-the-art cold rolling mill for small-diameter pipes made of microstructures of riveted steel 08Cr18Mn10Ti in cross-sectional and longitudinal sections of the pipes on the outer and inner surfaces of the pipes and between them for four possible feeding and turning modes. For the first time, experimental industrial data on the values of strength limit, yield strength and ultimate elongation at four feeding and turning modes have been obtained as well. Practical value. The obtained experimental industrial data from a set of quality parameters of pipes – metal microstructure, mechanical properties, transverse differences in pipe packages allow one to choose modes of supply and rotation in the production of cold-formed pipes to ensure compliance with regulated quality parameters of supply and rotation pipes.

show abstract

Section: Tablementioning

confidence: 99%

mentioning

confidence: 99%

Microstructures and mechanical properties of cold rolled pipes with increased small deformation

Holovchenko,

Grigorenko,

Protsiv

2023

Nauk. visn. nat. hirn. univ.

View full text Add to dashboard Cite

show abstract

“…Холодну пільгерну прокатку труб використовують ще й для виробництва труб з вуглецевих сталей, сплавів на основі титану, так і у виробництві труб з кольорових металів. Є дослідження з забезпечення якості труб регламентованими нормами та стандартам за точністю труб [1], та за мікроструктурою [2].…”

unclassified

Study of the influence of the mode of rotation of pipe in the cold rolling process on the microstructure, mechanical properties and accuracy

Нolovchenko

2023

Coll. res. pap. nat. min. univ.

View full text Add to dashboard Cite

Goal. Obtaining experimental results on the influence of the turning mode during cold rolling on the microstructure, mechanical properties and accuracy of the geometry of the pipes to improve their quality. Method. Experiments were carried out on equipment used in production and having appropriate inspections. We used a grinding machine, a device for electrolytic etching, a MIM 7 microscope, and a press for stretching samples. The accuracy of the geometric dimensions was determined using tube micrometers. Rolling route 25×2.5 mm → 16×1.5 mm. Steel 08Х18Н10Т. The results. Two rotation modes were performed: mode 1 – feed 2, 3, 4, 5 mm in front of the straight one, and the rotation before the reverse movement of the cage; mode 2 – feed 2, 3, 4, 5 mm in front of the straight, and turn in front of the straight and reverse movement of the cage.For mode 2, in comparison with mode 1, the grain size near the inner surface of the pipes is visually smaller than near the outer surface.The strength limit, yield strength and relative elongation for modes 1 and 2 were found to be close in value.With regard to the accuracy of the geometry of the pipes, it was determined that in mode 2 compared to mode 1: – the transverse thickness of the pipes decreases by 1.4–1.6 times; – the ovality of the pipes is reduced by 1–2 times (feeds from 2 to 5 mm); – the spread of the diameter along the length of the pipe decreased almost twice. Scientific novelty. For the first time, new experimental industrial data on the influence of the rotation mode on the microstructure were obtained. It is shown that the grain size near the inner surface of the pipes is smaller than near the outer surface.For the first time, obtained experimental industrial data on the effect of the tube rotation mode on the values of strength limit, yield strength and ultimate elongation showed that the rotation mode did not affect their change.Additional experimental dependences on the influence of the pipe rotation mode on the transverse variation, ovality and spread of the outer diameter of the pipes during cold rolling of the pipes were obtained - the reduction of the transverse variation was 1.4–1.6 times, ovality 1–2 times, and the diameter variation was almost 2 times. Practical significance. The obtained results are needed in the development of technologies for the production of pipes with increased quality requirements (microstructure, heterogeneity, ovality, diameter dispersion).

show abstract

“…Вступ. На ефекти, що відбуваються в металі при дії на нього енергії високої щільності, значно впливають параметри методу, що використовується [1][2][3][4][5][6]. При ударно-хвильовому (вибуховому) навантаженні параметри залежать від схеми навантаження.…”

unclassified

Characteristics of changes in microstructure and mechanical characteristics under high energy load

Kozechko,

Kozechko

2023

Coll. res. pap. nat. min. univ.

View full text Add to dashboard Cite

Purpose. Verification of the hypothesis about the possibility of obtaining a fine-grained structure of a metal as a result of processing with high-density energies. The methods. The research was carried out on cylindrical samples with a diameter of 50 mm and a length of 300 mm, which were made of structural steel 45 in a normalized state. The thickness of the inner coaxial layer BP1 with a detonation speed D=7.5 km/s was 3 mm, the thickness of the outer layer BP2 with a detonation speed D=3.5 km/s was 40 mm. The two-layer BP charge used in the experiment increases the duration of the shock wave and at the same time protects the samples from destruction. Findings. The mechanism of nanostructuring, in general terms, consists in the accumulation of the degree of deformation without destruction, which leads to the defragmentation of the structure with a significant increase in the density of dislocations. One of the methods that allows you to achieve a high density of dislocations, comparable to IPD, is treatment with shock waves. The change in the grain structure in the places of the pores indicates extremely high degrees of inhomogeneous deformation in these areas. During the passage of the shock wave in the middle of the sample, at the boundaries of the interface of phases with different densities, diffraction wave effects occur, which lead to the occurrence of shear deformations. It can be assumed that in the area of pores and microcracks, the deformation conditions are similar to those realized by some methods of intensive plastic deformation. This leads to a sharp grinding of the grain structure and a corresponding change in mechanical properties. The originality. The paper found that the processing of steel parts with the help of high-density energy leads to a sharp grinding of the grain to the nanostructure size and, as a result, to an increase in mechanical properties. The revealed regularities make it possible to obtain optimal parameters of high-energy processing, which lead to an increase in hardness, a redistribution of internal stresses and a decrease in surface roughness. Practical implementation. Obtaining grains with nanostructural characteristics in the structure of the material will allow to create fundamentally new devices and materials. Such materials will have properties significantly exceeding their achieved level – which is important for many fields of engineering, medicine, biotechnology, environmental protection, defense, etc.

show abstract

A deformation mode in a cold rolling condition to provide the necessary texture of the Ti-3Al-2.5V alloy

Cited by 6 publications

References 13 publications

Microstructures and mechanical properties of cold rolled pipes with increased small deformation

Microstructures and mechanical properties of cold rolled pipes with increased small deformation

Study of the influence of the mode of rotation of pipe in the cold rolling process on the microstructure, mechanical properties and accuracy

Characteristics of changes in microstructure and mechanical characteristics under high energy load

Contact Info

Product

Resources

About