Texture and mechanical properties of API X100 steel manufactured under various thermomechanical cycles

Nafisi, Shahrooz; Arafin, Muhammad; Collins, Laurie; Szpunar, Jerzy A.

doi:10.1016/j.msea.2011.09.072

Cited by 106 publications

(40 citation statements)

References 11 publications

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“…6,7) An overall grain refinement was expected by rough rolling 64% in 7 passes above the calculated non recrystallization temperature, i.e. T nr (958°C) 8) to achieve adequate recrystallization of the ascast austenite grains.…”

Section: Methodsmentioning

confidence: 99%

Effect of Vanadium Addition on the Strength of API X100 Linepipe Steel

et al. 2016

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Section: Methodsmentioning

confidence: 99%

Effect of Vanadium Addition on the Strength of API X100 Linepipe Steel

et al. 2016

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“…A nearly random texture is typical of low carbon steels finished using an austenitic hot rolling strategy which was shown as starting material ( fig.2a), however the strong {001}//ND texture have a harmful effect on mechanical properties. Because in these grains, the {001} cleavage planes are oriented almost parallel to the rolling plane, facilitating crack propagation along them, and thus along the rolling plane of the pipe wall [9], beside cleavage along the {001} planes were found to be the main cause of transgranular crack growth in the rolling plane as well as of crack deflection in the ND direction [10].…”

Section: B Textural Evolution In Processingmentioning

confidence: 99%

Texture Inhomogeneities Through Thickness by Hot Rolling With Different Heat Treatment Processes of Api 5l X70

Masoumi

Abreu

2015

Proceedings of the International Symposium on Crystallography

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Abstract-In this work the influence of different thermomechanical paths and heat treatments on crystallographic texture through thickness of API 5L X70 pipeline steel has been studied by using X-ray diffraction, electron backscattered diffraction (EBSD) and scanning electron microscope (SEM). The samples were hot rolled at 1000 °C to 44% and 67% reduction in thickness and then heat treatment processes such as annealing, water quenching and quench-tempering were done to evaluate microstructure and crystallographic texture changing through thickness. Banded ferrite-pearlite microstructure has shown in as received material, was changed to acicular ferrite, quasipolygonal ferrite, granular bainite, martensite and retained austenite during different heat treated processes. In rolling, inhomogeneity of texture has often been observed due to friction between rolls and material, in this manner, rolling schedules induced crystallographic texture dominated by the {112}//ND, {111}//ND, and {011}//ND fibers, which {110}//ND fiber was formed mainly through surface plan but {112}, {111}//ND and {001} <110> texture component were developed in mid plan of samples. As a result, better understanding of these processes is the key to improving and optimizing the structures of both current and future pipeline steels.Idex Terms-Thermomechanical path; Crystallographic texture; Shear deformation I. INTRODUCTION ince pipeline steels are extensively used for transportation of oil and natural gas for long distances, the demand for them has been increased considerably in recent years [1]. Mechanical properties of steels have been improved through control microstructure and hardness, reduction in inclusion morphology, and use of low segregated uniform microstructures [2]. In this study control of crystallographic texture through thickness has been proposed as a means to improve mechanical properties.Asbeck and Mecking [3] showed that the texture inhomogeneity results from inhomogeneous shear deformation occurring during rolling, whereas the surface texture is caused by the surface roughness of the rolls. This shear strain has the value zero in the center plane of the sheet and reaches a maximum value either at the surface or possibly also in an intermediate layer, depending on the geometrical conditions. High value of hardness at surface is resulted by work hardening caused by resultant shear strain due to friction between rolls and sheet. It is found that large amount of additional shear strain is applied to surface of cold rolled sheet due to friction between rollers and sheet surface when rolling is carried out without lubrication [4]. Remaining shear stress caused textural and micro structural inhomogeneity along thickness direction.Most analyses of the textures developed on rolling, assume that plane strain conditions apply and that the texture develops uniformly through the thickness of the material. However, this is rarely true in practice, and through-thickness variations are commonly found [5]. The two most important parameters are...

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“…The development of the (112) [1] and (111) [10] texture components in the ACN and WQ700 samples improved the mechanical properties. -…”

mentioning

confidence: 94%

“…Blonde et al 9 showed that the grains associated with {100} planes are the most strained by the applied stress in comparison to the strain development for other grain orientations. Nafisi et al 10 and Yang et al 11 also studied the effect of texture evolution on the mechanical properties of API X100 steel. They concluded that the (001)<110> rotated cube components provide cleavage planes that facilitate crack nucleation and propagation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Rolling in the Recrystallization Temperature Region Associated with a Post-Heat Treatment on the Microstructure, Crystal Orientation, and Mechanical Properties of API 5L X70 Pipeline Steel

2016

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In order to improve the mechanical properties of API X70 pipeline steel, a rolling schedule in the recrystallization temperature region associated with a post heat treatment was proposed. Optical and scanning electron microscopy, electron backscattered diffraction, hardness, and tensile tests were carried out to show the effects of microstructure and crystallographic orientation on the final mechanical properties. The normalized hot-rolled sample and the sample subjected to hot-rolling followed by quenching and consequent tempering at 700 °C exhibited an excellent combination of yield strength and elongation. This was attributed to the recrystallized ferrite microstructure and tempered martensite with martensite-austenite constituent dispersion, respectively. In addition, the development of (112) [1̅ 1̅ 1] and (111)[101̅ ] texture components and the high fraction of low angle boundaries have a significant effect on the improvement of the mechanical properties.

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Texture and mechanical properties of API X100 steel manufactured under various thermomechanical cycles

Cited by 106 publications

References 11 publications

Effect of Vanadium Addition on the Strength of API X100 Linepipe Steel

Effect of Vanadium Addition on the Strength of API X100 Linepipe Steel

Texture Inhomogeneities Through Thickness by Hot Rolling With Different Heat Treatment Processes of Api 5l X70

Effect of Rolling in the Recrystallization Temperature Region Associated with a Post-Heat Treatment on the Microstructure, Crystal Orientation, and Mechanical Properties of API 5L X70 Pipeline Steel

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