Dispersion strengthening in vanadium microalloyed steels processed by simulated thin slab casting and direct charging. Part 2 - chemical characterisation of dispersion strengthening precipitates

J.A. Wilson, A.J. Craven, Y. Li, T.N. Baker

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Abstract

The composition of the sub-15 nm particles in six related vanadium high strength low alloy steels, made by simulated thin slab direct charged casting, has been determined using electron energy loss spectroscopy (EELS). Such particles are considered to be responsible for dispersion hardening. For the first time, particles down to 4 nm in size have had their composition fully determined. In all the steels, the particles were nitrogen and vanadium rich and possibly slightly sub-stoichiometric carbonitrides. Equilibrium thermodynamics predicted much higher carbon to metal atomic ratios than observed in all cases so that kinetics and mechanical deformation clearly control the precipitation process. Thus it is important to formulate the steel with this in mind.
Original languageEnglish
Pages (from-to)519-527
Number of pages8
JournalMaterials Science and Technology
Volume23
Issue number5
DOIs
Publication statusPublished - May 2007

Keywords

  • low alloy steel
  • electron microscopy
  • spectroscopy
  • precipitation
  • direct charged process
  • material science

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