Tensile Deformation and Fracture Behavior of API-5L X70 Line Pipe Steel

Лобанов, М. Л.; Хотинов, В. А.; Urtsev, V. N.; Данилов, С. В.; Urtsev, N. V.; Platov, S. I.; Stepanov, S. I.

doi:10.3390/ma15020501

Cited by 10 publications

(7 citation statements)

References 36 publications

(63 reference statements)

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“…The separation of the samples for the investigation of mechanical property anisotropy was carried out along three directions: rolling direction (RD), transverse direction (TD) and at an angle of 45 • to RD. Strain at the stage of necking was measured according to the method described in [4,41].…”

Section: Methodsmentioning

confidence: 99%

“…Contemporary HSLA steels and a specific industrial method of their processing that comprises controlled hot rolling and adjustable accelerated cooling (thermomechanical controlled processing-TMCP) are used to obtain the required combination of mechanical properties in steel plates designed for natural gas and crude oil pipeline production [1][2][3][4]. Increased resistance to the localization of plastic deformation and failure resistance are characteristic features of the pipeline products manufactured by means of TMCP.…”

Section: Introductionmentioning

confidence: 99%

“…Studies [4,5,[10][11][12][13][14][15][16]18,24] have pointed out the significance of crystallographic texture after TMCP in the formation of anisotropy of mechanical properties-foremost, ductility of a material that determines the level of resistance to the formation and propagation of the running fracture. More specifically, a study [10] demonstrated that the anisotropy of mechanical properties of steel plates is determined by {112}<110> and {223}<110> components.…”

Section: Introductionmentioning

confidence: 99%

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Phase Transformation Crystallography in Pipeline HSLA Steel after TMCP

Лобанов

Зорина

Карабаналов

et al. 2023

Metals

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Thermo-mechanical controlled processing (TMCP) is employed to obtain the required level of mechanical properties of contemporary high-strength low-alloy (HSLA) steel plates utilized for gas and oil pipeline production. The strength, deformation behavior and resistance to the formation and propagation of running fractures of the pipeline steel are mainly determined by its microstructure and crystallographic texture. These are formed as a result of austenite deformation and consequent γ→α-transformation. This present study analyses the crystallographic regularities of the structural and textural state formation in a steel plate that has been industrially produced by means of TMCP. The values of the mechanical properties that have been measured in different directions demonstrate the significance of the crystallographic texture in the deformation and failure of steel products. An electron backscatter diffraction (EBSD) method and crystallographic analysis were utilized to establish the connection between the main texture components of the deformed austenite and α-phase orientations. This paper demonstrates that the crystallographic texture that is formed due to a multipath γ→α-transformation results from the α-phase nucleation on the special boundaries between grains with γ-phase orientations. The analysis of the spectra of the α-γ-interface boundary angle deviations from the Kurdjumov–Sachs (K–S), Nishiyama–Wassermann (N–W), and Greninger–Troiano (G–T) orientation relationships (ORs) allows to suggest that the observed austenite particles represent a secondary austenite (not retained) that precipitates at intercrystalline α-phase boundaries and correspond to the ORs with regard to only one adjacent crystallite.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phase Transformation Crystallography in Pipeline HSLA Steel after TMCP

Лобанов

Зорина

Карабаналов

et al. 2023

Metals

Self Cite

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“…3 е). Это совпадает с текстурой термической обработки трубных сталей, приведенной в работах [18,19].…”

Section: результаты и обсуждениеunclassified

Determination of austenite grain size in ferritic-martensitic stainless steel by orientation microscopy methods

Satskii,

Soloveva,

Ustinov

et al. 2024

DREAM

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The development of chromium stainless steels is caused by the need for creating materials showing an optimal combination of physical, mechanical, and chemical properties when used in aggressive environments. Currently, for the production of industrial tubular articles functioning under load at high temperatures, it is promising to use stainless steels of the ferritic-martensitic and martensitic classes, strengthened by additional alloying. The achievement of a given set of properties in steels and alloys is determined by the homogeneity of the chemical and phase compositions, microstructure and crystallographic texture. The formation of these parameters for heat-treated materials is mainly determined by the characteristics of the grains of austenite formed during heat treatment before quenching. The size and shape of austenite grains determine the morphology and dispersion of the products of γ→α′(α) phase transformation. Orientation microscopy methods based on backscattered electron diffraction are used to study the restorability of high-temperature austenite grains for samples of a low-carbon high-alloy stainless steel of the ferritic-martensitic class, with ~12 wt% Cr, additionally alloyed with Ni, Mo, W, Nb, and V. After heat treatment, the samples have a ferrite-martensite and ferrite-bainite structure. When restoring austenite grains, we used the orientation relationships (ORs) of Kurdyumov–Sachs (K–S), Nishiyama–Wasserman (N–W), Greninger–Troyan (G–T), and new ORs proposed by V. S. Kraposhin (ORK). The fundamental possibility of restoring pre-existing austenite grains is shown. The restoration is based on the crystallographic features of both ferrite-martensite and ferrite-bainite structures. The most valid results in austenite grain recovery were obtained when OR K–S and ORK were used.

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“…It is applied in solving various challenges in materials science [ 7 , 8 ], solid mechanics [ 9 ], civil engineering [ 10 , 11 , 12 , 13 ], etc. It has to be mentioned, that other techniques applied recently for mechanical testing analysis were used successfully, like Acoustic Emission Technique (AET) [ 14 ] or micrography and morphology [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

A New Approach for Evaluation True Stress–Strain Curve from Tensile Specimens for DC04 Steel with Vision Measurement in the Post-Necking Phases

Świłło

Cacko

2023

Materials

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The paper presents an experimental evaluation of deformation of flat samples during uniaxial tensile testing, including uniform deformation and post-necking phases. The authors recommend a specially designed vision extensometer and simplified image processing method for analytical correction of triaxial test results for extended stress–strain curve estimation. A modified correction model is proposed, based on the application of Gaussian functions, to determine the neck geometry of the tested sample. The vision extensometer can monitor a specimen’s elongation using two fibre-optic gauges inserted into the material. Measurements taken from the vision extensometer are compared with readings from analogue gauges within the range of uniform deformation. The analytical correction model’s ability to correctly assess the extended true stress–strain curve in the post-necking phase was investigated. Image processing forms the basis of an efficient method for identifying the contour of the specimen’s neck. Digital image correlation (DIC) was used to verify the proposed solutions and assess the results obtained for the uniform and post-neck deformation phases. The change in thickness of the sample was experimentally measured throughout the tensile test with a digital gauge sensor and compared with the results of the digital image correlation.

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Tensile Deformation and Fracture Behavior of API-5L X70 Line Pipe Steel

Cited by 10 publications

References 36 publications

Phase Transformation Crystallography in Pipeline HSLA Steel after TMCP

Phase Transformation Crystallography in Pipeline HSLA Steel after TMCP

Determination of austenite grain size in ferritic-martensitic stainless steel by orientation microscopy methods

A New Approach for Evaluation True Stress–Strain Curve from Tensile Specimens for DC04 Steel with Vision Measurement in the Post-Necking Phases

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