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  • 2005-2009  (4)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Study of Texture Development and Anisotropy of Mechanical Properties of API-X80 Line Pipe Steel for Spiral-Welded Pipe (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 495-497 (Sept. 2005), p. 531-536 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: 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 steelconsisted 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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.495-497.531.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Microstructure - Texture Related Toughness Anisotropy of API-X80 Pipeline Steel Characterized by Means of 3D-EBSD Technique (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 558-559 (Oct. 2007), p. 1429-1434 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The variations of in plane Charpy toughness anisotropy as a function of the microstructureand texture of an industrial grade of API –X80 pipeline steel was studied. Standard size Charpysamples with a long axis orientated at 0, 22.5, 45, 67.5 and 90° with respect to the rolling directionof the plate were tested at different temperatures varying from -196°C to 20°C. Microstructure andtexture of the plates were investigated by means of electron backscattering diffraction (EBSD),XRD and the recently developed 3D EBSD technique.The spatial grain shape orientation distribution was examined on samples which were cut from themiddle thickness of an industrial rolled plate by means of 3D EBSD and following grain shape reconstructionand approximation of the grain shape with ellipsoids. It was found that the experimentallyobserved 3D microstructures could well be correlated to the anisotropy of the measuredCharpy impact toughness of the steel for the Charpy samples. The Charpy toughness anisotropy ofthe plates in the transition region where both ductile and brittle fractures take place can be related tothe microstructural anisotropy characterized by the grain shape orientation and the spatial distributionof the 2nd phase
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.558-559.1429.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Three Dimensional Microstructure–Microtexture Characterization of Pipeline Steel (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 550 (July 2007), p. 625-630 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The microstructural anisotropy together with the crystallographic texture of an industrialgrade of X70 pipeline steel is studied by means of the 3D-EBSD technique known also as EBS3which was recently developed by FEI. Samples of size 8x10x3mm³ were cut from the middle thicknessof an industrial rolled plate and after special sample preparation have been studied in a Nova600 dual beam scanning electron microscope equipped with a field emission gun and HKL Channel6 EBSD data collection software for crystallographic orientation, which allows multiple sectioningof the sample in automatic mode and, afterwards reconstruction of both the 3D microstructure andtexture of the examined volume. Three scanned zones of different volumes that varied between15x10x27 4m³ and 16x14x6 4m³ have been examined and the results for the crystallographic orientation,grain shape and grain shape orientation are discussed together with the data for the anisotropyof the Charpy impact toughness of the material
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.550.625.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Microstructure - Texture Related Toughness Anisotropy of API-X80 Pipeline Steel (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 840-845 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The dependence of Charpy toughness on the microstructure and texture of two industrialgrades of API –X80 pipeline steel with a thickness of 15 and 17 mm, respectively, were studied inthis work. Standard size Charpy samples with a long axis orientated at 0, 22.5, 45, 67.5 and 90°with respect to the rolling direction of the plate were tested at different temperatures varying from-196°C to 20°C. Microstructure and texture of the plates were studied by means of electron backscatteringdiffraction (EBSD) and XRD. The highest value of the absorbed energy (440 J) wasmeasured at room temperature in the samples oriented with the long axis parallel to the rolling directionand the minimum values for the same temperature were observed in the samples enclosingan angle of 45° to RD (340J). Statistical model parameters obtained from Charpy impact tests werequantitatively correlated to microstructural parameters by means of a linear regression model withthe aim to describe the Brittle-Ductile Transition Curve in terms of microstructural features. Basedon dedicated experiments the Brittle Fracture Factor (BFF) parameter was introduced, which quantifiesthe fraction of the {100} planes oriented parallel to the crack propagation front. It was foundthat the Charpy toughness anisotropy of the plates in the lower shelf region can not be related onlyto their crystallographic texture, but to the microstructural anisotropy characterized by the grain sizevariations i.e. the density of grain boundaries in the different directions. Also the spatial distributionof the 2nd phase plays a determining role in the fracture behavior
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.840.pdf
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    Paper (German National Licenses)
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