Study of Texture Development and Anisotropy of Mechanical Properties of API-X80 Line Pipe Steel for Spiral-Welded Pipe

Jin Ho Bae; Shi Hoon Choi; Ki Soo Kim; Ki Bong Kang

doi:10.4028/www.scientific.net/MSF.495-497.531

Paper Titles

Monte Carlo Modeling of Low Carbon Steel Recrystallization: Role of Thermo-Mechanical Treatment and Chemical Composition
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Development of Cold Rolling and Intercritical Annealing Texture in Two TRIP-Aided Steels
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Influence of Starting Microstructure on Texture Development in Cold Rolled and Annealed Low Carbon Steel Strip
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Comparison between the Growth Behaviour of the Small Goss Grains and that of the Large Matrix Grains in Silicon Steels. Influence of the Textured Cluster Presence
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Study of Texture Development and Anisotropy of Mechanical Properties of API-X80 Line Pipe Steel for Spiral-Welded Pipe
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Influence of Boron on Mechanical Properties and Microstructures of Hot-Rolled Interstitial Free Steel
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Texture Optimization in Non-Oriented Electrical Steels: The Role of the Goss Texture Component
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Modelling of Recrystallisation Kinetics and Texture during the Thermo-Mechanical Processing of Aluminium Sheets
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Friction Effects on Through-Thickness Texture Evolution during Rolling
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Study of Texture Development and Anisotropy of Mechanical Properties of API-X80 Line Pipe Steel for Spiral-Welded Pipe

Abstract:

This study has been conducted to analyze the effect of texture and microstructure on the anisotropy of yield strength and Charpy fracture toughness of an X80 line pipe steel. The texture and microstructure were investigated by X-ray diffractometer and electron backscattered diffraction (EBSD). The yield strength and impact energy were measured along 0o (longitudinal), 30o and 90o (transverse) to the rolling direction. It was found that the microstructure of the developed steel consisted of fine acicular and polygonal ferrite with small pearlite and martensite or retained austenite (MA constituents). The major components of textures were {332}<113> and {113}<110> orientations. In order to investigate the effect of both morphological and crystallographic texture on yield strength anisotropy, the prediction of the plastic property was carried out by using a viscoplastic self-consistent (VPSC) polycrystal model. The predicted anisotropy of yield strength with VPSC model assuming ellipsoidal grain shape was in a good agreement with experimental observation. EBSD results showed that the density of {001} cleavage planes of Charpy specimen, 30 degree to rolling direction, was the highest compared with that of other specimens. Therefore, the highest susceptibility to the cleavage fracture, i.e. increased ductile-brittle transition temperature, can be seen in the 30 degree direction.