Impact of friction stir welding on the microstructure of ODS steel

JOURNAL OF NUCLEAR MATERIALS

卷:486

Article

Dawson, H.¹  Serrano, M.²  Cater, S.³  Iqbal, N.³  Almasy, L.^4,5  Tian, Q.⁵  Jimenez-Melero, E.^1,6 

[1] Univ Manchester, Sch Mat, Oxford Rd, Manchester M13 9PL, Lancs, England

[2] CIEMAT, Struct Mat Div, Dept Technol, Avda Complutense 40, E-28040 Madrid, Spain

[3] TWI Technol Ctr, Joining Technol Grp, Frict & Forge Proc Dept, Adv Mfg Pk,Wallis Way, Rotherham S60 5TZ, S Yorkshire, England

[4] Southwest Univ Sci & Technol, State Key Lab Cultivat Base Nonmetal Composites &, Mianyang 621010, Peoples R China

[5] Inst Solid State Phys & Opt, Wigner Res Ctr Phys, POB 49, H-1525 Budapest, Hungary

[6] Univ Manchester, Dalton Cumbrian Facil, Moor Row CA24 3HA, England

关键词: ODS steel;    Friction stir welding;    Small angle neutron scattering;    Particle size distribution;    Zener pinning;   

DOI  :  10.1016/j.jnucmat.2016.12.033

来源: Elsevier

【 摘 要 】

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. (C) 2017 Elsevier B.V. All rights reserved.

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