Control of intermetallic nano-particles through annealing in duplex low density steel

Alireza Rahnama, Stephen Spooner, Seetharaman Sridhar

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

In high Al-low-density steels for future vehicle light weighting, it is vital to design a thermal profile to form and retain the uniformly dispersed nanosize B2-type intermetallic precipitates that are crucial for the material strength. In this paper, the influence of heating rate, during annealing to 1050°C was simulated in a Au-image furnace. The post annealing structure was then characterized and two different morphologies of B2 particles were observed: triangle-like with a few micrometres (≈1.4 μm) and disk-like precipitates with a diameter of around a few hundred nanometres. It was found that a slower heating rate (2.5°C/s) led to an increase in the volume fraction and to uniform distribution of particles within the microstructure and considerably affected the shape and size of the precipitates.

Original languageEnglish (US)
Pages (from-to)13-16
Number of pages4
JournalMaterials Letters
Volume189
DOIs
StatePublished - Feb 15 2017
Externally publishedYes

Keywords

  • Heat treatment
  • Low density steel
  • Mechanical properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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