On low temperature bainite transformation characteristics using in-situ neutron diffraction and atom probe tomography

Khushboo Rakha*, Hossein Beladi, Ilana Timokhina, Xiangyuan Xiong, Saurabh Kabra, Klaus Dieter Liss, Peter Hodgson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

In-situ neutron diffraction was employed to monitor the evolution of nano-bainitic ferrite during low temperature isothermal heat treatment of austenite. The first 10 peaks (austenite, γ and ferrite, α) were monitored during austenization, homogenisation, rapid cooling and isothermal holding at 573 K. Changes in the α-110 and γ-111 peaks were analysed to determine the volume fraction changes and hence the kinetics of the phase transformation. Asymmetry and broadening in the α-200 and γ-200 peaks were quantified to lattice parameter changes due to carbon redistribution as well as the effects of size and dislocation density. Atom Probe Tomography was then used to confirm that, despite the presence of 1.5 mass% Si, carbide formation was evident. This carbide formation is the cause of poor ductility, which is lower than expected in such steels.

Original languageEnglish
Pages (from-to)303-309
Number of pages7
JournalMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume589
DOIs
StatePublished - 1 Jan 2014
Externally publishedYes

Keywords

  • Atom probe tomography
  • Bainite
  • Neutron diffraction
  • Phase transformation

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