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

• Author(s) / Creator(s)

  • Chatelier, C.
  • Wiskel, J.B.
  • Ivey, D.G.
  • Henein, H.

• 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 m—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.

• Date created

  2018-01-01

• Subjects / Keywords

  • Quantitative X-Ray Diffraction
  • Rietveld Refinement
  • X70
  • ICP
  • Microalloyed Steels
  • Matrix Dissolution

• Type of Item

  Article (Published)

• DOI

  https://doi.org/10.7939/R3QJ78D3P

• License

  Attribution 4.0 International