Impact of friction stir welding on the microstructure of ODS steel

H. Dawson, M. Serrano, S. Cater, N. Iqbal, L. Almásy, Q. Tian, E. Jimenez-Melero

Research output: Contribution to journalArticle

10 Citations (Scopus)
5 Downloads (Pure)

Abstract

We have assessed the impact of the welding parameters on the nano-sized oxide dispersion and the grain size in the matrix of an ODS steel after friction stir welding. Our results, based on combined small angle neutron scattering and electron microscopy, reveal a decrease in the volume fraction of the particles smaller than 80 nm in the welds, mainly due to particle agglomeration. The increase in tool rotation speed or decrease in transverse speed leads to a higher reduction in nano-sized particle fraction, and additionally to the occurrence of particle melting. The dependence of the average grain size in the matrix on the particle volume fraction follows a Zener pinning-type relationship. This result points to the principal role that the particles have in pinning grain boundary movement, and consequently in controlling the grain size during welding.

Original languageEnglish
Pages (from-to)129-137
Number of pages9
JournalJournal of Nuclear Materials
Volume486
Early online date28 Dec 2016
DOIs
Publication statusPublished - 1 Apr 2017
Externally publishedYes

Bibliographical note

© 2017, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.

Keywords

  • Friction stir welding
  • ODS steel
  • Particle size distribution
  • Small angle neutron scattering
  • Zener pinning

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)

Fingerprint Dive into the research topics of 'Impact of friction stir welding on the microstructure of ODS steel'. Together they form a unique fingerprint.

  • Cite this

    Dawson, H., Serrano, M., Cater, S., Iqbal, N., Almásy, L., Tian, Q., & Jimenez-Melero, E. (2017). Impact of friction stir welding on the microstructure of ODS steel. Journal of Nuclear Materials, 486, 129-137. https://doi.org/10.1016/j.jnucmat.2016.12.033