Luders Deformation Mechanisms on Yield Point in X80 Grade Pipeline with Ultrafine Structure

Polukhina, O. N.; Вичужанин, Д. И.; Хотинов, В. А.; Schapov, G. V.; Farber, V. M.

doi:10.18502/keg.v1i1.4423

Cited by 2 publications

(3 citation statements)

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“…Research [25,26] shows that the formation of the Lüders band occurs in the area of highest stress concentration, i.e., in the area with a significant accumulation of dislocations. Other research on low carbon steel [27,28] has established higher values of local strains in the area behind the Lüders band front during propagation. The authors in [29] found that Lüders bands are formed in steels with precipitates which represent obstacles to the movement of dislocations.…”

Section: Introductionmentioning

confidence: 93%

“…However, a detailed mechanism of the Lüders band formation in niobium microalloyed steel has not been established because the conducted research has been more focused on determining the influence of different parameters on Lüders band propagation [27]. Therefore, the aim of this study is to determine the mechanism of Lüders band formation and the influence of fine niobium-containing precipitates, as well as the role of niobium, carbon and nitrogen atoms on the formation of Lüders bands.…”

Section: Introductionmentioning

confidence: 99%

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The Deformation Behavior of Niobium Microalloyed Steel during Lüders Band Formation

Brlić,

Rodič,

Samardžić

et al. 2023

Metals

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In microalloyed steels, plastic instabilities often appear which have been found to be associated with changes in the microstructure. In this paper, research was carried out on the influence of the microstructure in different areas of the deformation zone during the formation of Lüders bands in niobium microalloyed steel. Thermography and digital image correlation during static tensile testing were used to research deformation behavior and the area before and during the formation of the Lüders band. Different local values of temperature changes, i.e., stress changes, and strains in the examined areas during the formation of the Lüders band were determined. The highest values of the temperature changes and strains during the formation of the Lüders band were measured in the area of the initial appearance of the Lüders band. In order to clarify the observed changes, a microstructural analysis, using X-ray diffraction, scanning electron and transmission electron microscopy methods, was used. It was established that the observed temperature, i.e., stress, and strain changes are related to changes in the microstructure. The analyses of changes in the microstructure, arrangement and interaction of dislocations with precipitates revealed significant changes in the movement of dislocations and their interaction with fine niobium-containing precipitates during the formation of Lüders bands. The influence of microstructural parameters on the Lüders band formation in niobium microalloyed steel has been established based on this research.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

The Deformation Behavior of Niobium Microalloyed Steel during Lüders Band Formation

Brlić,

Rodič,

Samardžić

et al. 2023

Metals

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show abstract

“…Under certain conditions, with these methods it can be determined distribution and values of temperature changes (associated with stress changes in deformed metal [10]) and deformation during the plastic flow both of steel and other metal materials [11,12]. Thermography and DIC results can be presented by line and point analysis, thus analysis of a certain zone of interest that shows appearance and propagation of the Lüders band, but also other phenomena happening during the plastic deformation of steel [13][14][15][16]. Lüders band is researched in different ways by developing mathematical models [17], by determining the influence of microstructure [18,19], strain rate [20], etc.…”

Section: Introductionmentioning

confidence: 99%

Line Analysis of Changes in the Deformation Zone During Lüders Band Propagation

2024

Teh. vjesn.

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In order to determine the Lüders band propagation along the deformation zone length and width as affected by the force action direction, a detailed line analysis is performed by applying thermography and digital image correlation (DIC) during static tensile test at different test positions. The test is stopped at the point when the Lüders band propagation reached its middle to analyse temperature changes and deformations occurring in front of, on and behind the Lüders band front. Line analysis of the test samples confirmed that there are changes in the distribution of temperature and deformations. Across the width of the test sample, there are oscillations and differences in the distribution of temperature changes in the deformation zone. However, the same analysis showed that there are no differences in the change of deformations across the width of the test sample, except in the zone behind the Lüders band front where the Lüders band propagated. The influence of microstructure, i.e. the different dislocation density and the interaction of dislocations with fine precipitates, proved to be the cause of change in temperature and deformations measured at the moment when the Lüders band propagation reached its middle.

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Luders Deformation Mechanisms on Yield Point in X80 Grade Pipeline with Ultrafine Structure

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Cited by 2 publications

References 6 publications

The Deformation Behavior of Niobium Microalloyed Steel during Lüders Band Formation

The Deformation Behavior of Niobium Microalloyed Steel during Lüders Band Formation

Line Analysis of Changes in the Deformation Zone During Lüders Band Propagation

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