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Crystals 2018, 8(7), 287; https://doi.org/10.3390/cryst8070287

The Effect of Skelp Thickness on Precipitate Size and Morphology for X70 Microalloyed Steel Using Rietveld Refinement (Quantitative X-ray Diffraction)

1
Department of Chemical and Materials Engineering, University of Alberta, Edmonton, AB T6G 2V4, Canada
2
Mines Nancy, Université de Lorraine, Campus Artem, 92 rue Sergent Blandan, F-54000 Nancy, France
Current address: Institut Jean Lamour, Université de Lorraine F-54000 Nancy, France and Synchrotron SOLEIL, F-91190 Saint-Aubin, France.
*
Author to whom correspondence should be addressed.
Received: 11 June 2018 / Revised: 29 June 2018 / Accepted: 29 June 2018 / Published: 12 July 2018
(This article belongs to the Special Issue Rietveld Refinement in the Characterization of Crystalline Materials)
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Abstract

Precipitates in thin-walled (11 mm) and thick-walled X70 (17 mm) microalloyed X70 pipe steel are characterized using Rietveld refinement (a.k.a. quantitative X-ray diffraction (QXRD)), inductively coupled plasma mass spectrometry (ICP), and energy-dispersive X-ray spectroscopy (EDX) analyses. Rietveld refinement is done to quantify the relative abundance, compositions, and size distribution of the precipitates. EDX and ICP analyses are undertaken to confirm Rietveld refinement analysis. The volume fraction of large precipitates (1 to 4 μm—mainly TiN rich precipitates) is determined to be twice as high in the thick-walled X70 steel (0.07%). Nano-sized precipitates (<20 nm) in the thin-walled steel exhibit a higher volume fraction (0.113%) than in the thick-walled steel (0.064%). The compositions of the nano-sized precipitates are similar for both steels. View Full-Text
Keywords: Rietveld refinement; quantitative X-ray diffraction; microalloyed steels; matrix dissolution; X70; ICP Rietveld refinement; quantitative X-ray diffraction; microalloyed steels; matrix dissolution; X70; ICP
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Chatelier, C.; Wiskel, J.B.; Ivey, D.G.; Henein, H. The Effect of Skelp Thickness on Precipitate Size and Morphology for X70 Microalloyed Steel Using Rietveld Refinement (Quantitative X-ray Diffraction). Crystals 2018, 8, 287.

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