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

doi:10.1016/j.jnucmat.2016.12.033

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 journal › Article › peer-review

22 Citations (Scopus)

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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 language	English
Pages (from-to)	129-137
Number of pages	9
Journal	Journal of Nuclear Materials
Volume	486
Early online date	28 Dec 2016
DOIs	https://doi.org/10.1016/j.jnucmat.2016.12.033
Publication status	Published - 1 Apr 2017
Externally published	Yes

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)

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10.1016/j.jnucmat.2016.12.033

Post-printAccepted author manuscript, 12.3 MBLicence: CC BY-NC-ND

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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.",

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AU - Cater, S.

AU - Iqbal, N.

AU - Almásy, L.

AU - Tian, Q.

AU - Jimenez-Melero, E.

N1 - © 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.

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N2 - 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.

AB - 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.

KW - Friction stir welding

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KW - Particle size distribution

KW - Small angle neutron scattering

KW - Zener pinning

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Impact of friction stir welding on the microstructure of ODS steel

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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