Small-angle neutron scattering reveals the effect of Mo on interphase nano-precipitation in Ti-Mo micro-alloyed steels

Research output: Contribution to journalArticle

Authors

  • Yiqiang Wang
  • Samuel James Clark
  • Diego Alba Venero
  • K Yan
  • Michael J Gorley
  • Elizabeth Surrey
  • David McCartney
  • Seetharaman S Sridhar
  • Peter D Lee

Colleges, School and Institutes

Abstract

Ti-containing micro-alloyed steels are often alloyed with molybdenum (Mo) to reduce nano-precipitate coarsening, although the mechanism is still disputed. Using small angle neutron scattering we characterised the precipitate composition and coarsening of Ti-alloyed and Ti-Mo-alloyed steels. The results demonstrate ~25 at.% of Ti is substituted by Mo in the (Ti, Mo)C precipitates, increasing both the precipitate volume percent and average size. Mo alloying did not retard precipitation coarsening, but improved lattice misfit between precipitate and matrix, contributing to better ageing resistance of the Ti-Mo-alloyed steel. This new understanding opens opportunities for designing ageing-resistant micro-alloyed steels with lean alloying elements.

Details

Original languageEnglish
Pages (from-to)24-28
Number of pages5
JournalScripta Materialia
Volume174
Early online date27 Aug 2019
Publication statusPublished - 1 Jan 2020

Keywords

  • Micro-alloyed steel, interphase precipitation, small-angle scattering