Formation of delta ferrite in 9 Wt Pct Cr steel investigated by in-situ x-ray diffraction using synchrotron radiation

P. Mayr, T. A. Palmer, J. W. Elmer, E. D. Specht, S. M. Allen

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Abstract

A study was conducted to demonstrate the monitoring of the formation and dissolution of δ-ferrite in a 9 wt pct chromium steel using in-situ X-ray diffraction (XRD) with synchrotron radiation during exposure to a single-weld thermal cycle. A 100-kg ingot of an experimental Fe-0.168C-0.23Si-0.22Mn-8.85Cr- 1.54Mo-0.18Ni-0.29V-0.057Nb-0.009B-0.016N steel was produced by conventional sand casting. It was normalized at temperature of 1373 K for 8 hours and then allowed to air cool at room temperature and tempered again for an additional 24 hours at the same temperature after air cooling at room temperature tempered at 1003 K for 10 hours. A tempered martensite microstructure without any delta ferrite was observed and finely dispersed precipitates were identified by analytical transmission electron microscopy as Cr-rich M23C 6 carbides, V-rich MX nitrides, and Nb-rich MX carbides.

Original languageEnglish (US)
Pages (from-to)2462-2465
Number of pages4
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume41
Issue number10
DOIs
StatePublished - Oct 2010

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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