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

^*Corresponding author for this work

Metallurgy and Materials

Research output: Contribution to journal › Article › peer-review

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
DOIs	https://doi.org/10.1016/j.jnucmat.2016.12.033
Publication status	Published - 1 Apr 2017

Bibliographical note

Funding Information:
We gratefully acknowledge the financial support of the Engineering and Physical Sciences Research Council UK (EPSRC) through the Centre for Doctoral Training in Advanced Metallic Systems under Grant Agreement EP/L016273/1. We would like to thank CIEMAT in Spain for providing the base material, MA956 ODS steel, and to The Welding Institute for providing the welding tools and assistance during friction stir welding. We also thank the Budapest Neutron Centre for the granted beam time and the European Commission under the 7th Framework Programme through the Key Action: Strengthening the European Research Area, Research Infrastructures under Grant Agreement no. 283883-NMI3-II, for support to perform the SANS experiment.

Publisher Copyright:
© 2017 Elsevier B.V.

Keywords

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

ASJC Scopus subject areas

Nuclear and High Energy Physics
General Materials Science
Nuclear Energy and Engineering

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10.1016/j.jnucmat.2016.12.033

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title = "Impact of friction stir welding on the microstructure of ODS steel",

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.",

keywords = "Friction stir welding, ODS steel, Particle size distribution, Small angle neutron scattering, Zener pinning",

author = "H. Dawson and M. Serrano and S. Cater and N. Iqbal and L. Alm{\'a}sy and Q. Tian and E. Jimenez-Melero",

note = "Funding Information: We gratefully acknowledge the financial support of the Engineering and Physical Sciences Research Council UK (EPSRC) through the Centre for Doctoral Training in Advanced Metallic Systems under Grant Agreement EP/L016273/1. We would like to thank CIEMAT in Spain for providing the base material, MA956 ODS steel, and to The Welding Institute for providing the welding tools and assistance during friction stir welding. We also thank the Budapest Neutron Centre for the granted beam time and the European Commission under the 7th Framework Programme through the Key Action: Strengthening the European Research Area, Research Infrastructures under Grant Agreement no. 283883-NMI3-II, for support to perform the SANS experiment. Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

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doi = "10.1016/j.jnucmat.2016.12.033",

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AU - Dawson, H.

AU - Serrano, M.

AU - Cater, S.

AU - Iqbal, N.

AU - Almásy, L.

AU - Tian, Q.

AU - Jimenez-Melero, E.

N1 - Funding Information: We gratefully acknowledge the financial support of the Engineering and Physical Sciences Research Council UK (EPSRC) through the Centre for Doctoral Training in Advanced Metallic Systems under Grant Agreement EP/L016273/1. We would like to thank CIEMAT in Spain for providing the base material, MA956 ODS steel, and to The Welding Institute for providing the welding tools and assistance during friction stir welding. We also thank the Budapest Neutron Centre for the granted beam time and the European Commission under the 7th Framework Programme through the Key Action: Strengthening the European Research Area, Research Infrastructures under Grant Agreement no. 283883-NMI3-II, for support to perform the SANS experiment. Publisher Copyright: © 2017 Elsevier B.V.

PY - 2017/4/1

Y1 - 2017/4/1

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

KW - ODS steel

KW - Particle size distribution

KW - Small angle neutron scattering

KW - Zener pinning

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EP - 137

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -

Impact of friction stir welding on the microstructure of ODS steel

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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