TOPICAL COLLECTION: ADVANCES IN MATERIALS MANUFACTURING AND PROCESSING Characterization of X80 and X100 Microalloyed Pipeline Steel Using Quantitative X-ray Diffraction J.B. WISKEL, X. LI, D.G. IVEY, and H. HENEIN Quantitative X-ray diﬀraction characterization of four (4) X80 and three (3) X100 microalloyed steels was undertaken. The eﬀect of through-thickness position, processing parameters, and composition on the measured crystallite size, microstrain, and J index (relative magnitude of crystallographic texture) was determined. Microstructure analysis using optical microscopy, scanning electron microscopy, transmission electron microscopy, and electron-backscattered diﬀraction was also undertaken. The measured value of microstrain increased with increasing alloy content and decreasing cooling interrupt temperature. Microstructural features corresponding to crystallite size in the X80 steels were both above and below the detection limit for quantitative X-ray diﬀraction. The X100 steels consistently exhibited microstructure features below the crystallite size detection limit. The yield stress of each steel increased with increasing microstrain. The increase in microstrain from X80 to X100 is also associated with a change in microstructure from predominantly polygonal ferrite to bainitic ferrite. https://doi.org/10.1007/s11663-018-1298-4 The Minerals, Metals & Materials Society and ASM International 2018  I. INTRODUCTION Previous work by the authors used quantitative X-ray diﬀraction (QXRD) to quantify the mean size
Metallurgical and Materials Transactions B – Springer Journals
Published: Jun 4, 2018
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