Observation of the reversible stabilisation of liquid phase iron during nitriding

Carl Slater, Stephen Spooner, Claire Davis, Seetharaman Sridhar

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Abstract

Confocal scanning laser microscopy has been used to observe in-situ cooling of Grade 1 iron whilst under a nitrogen atmosphere. Liquid iron has been stabilised to temperatures below 1400°C through nitriding at high temperatures. This has been achieved in two ways. Firstly by exposing the melt to nitrogen and observing the onset of solidification whilst cooling. Secondly, under isothermal conditions by re-melting of initially nitrogen free iron at 1400°C through the introduction of a nitrogen atmosphere. The latter process has been shown to be reversible with liquid iron being unstable once reverting back to a helium atmosphere.
Original languageEnglish
Pages (from-to)98-101
Number of pages4
JournalMaterials Letters
Volume173
Early online date9 Mar 2016
DOIs
Publication statusPublished - 15 Jun 2016
Externally publishedYes

Bibliographical note

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

Funder

The authors would like to thank EPSRC for funding (Grant number EP/M014002/1) and also WMG for their support and facilities.

Keywords

  • Liquid steel
  • Nitriding
  • In-situ observation
  • Phase balance

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