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  4. Solute-dislocation interactions and creep-enhanced Cu precipitation in a novel ferritic-martensitic steel
 
research article

Solute-dislocation interactions and creep-enhanced Cu precipitation in a novel ferritic-martensitic steel

Xiao, Bo
•
Xu, Lianyong
•
Cayron, Cyril  
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August 15, 2020
Acta Materialia

G115 steel has gained a growing interesting recently for its use in next-generation ultra-supercritical power plant applications. Due to the high densities of dislocations and lath martensite boundaries in G115 steel, interactions between solutes and dislocations result in unique microstructural evolution during creep with the formation of dense Cu-rich precipitates (CRPs) and M(23)C(6 )carbides. Atom-probe tomography reveals that Mn is preferentially associated with CRPs, probably because the Mn atoms reduce the critical energy of nucleation. Solute-dragging and precipitate-pinning effects enhance the formation of dislocation network during earlier creep deformation. Compared with aged G115 steel, long-term creep deformation accelerates the coarsening of CRPs. The fast diffusion of solutes along dislocations, dislocation network walls, and lath boundaries significantly increases the CRP coarsening kinetics. Particle coarsening reduces the pinning strength, causing the dislocation density to decrease and the dislocation network to disappear during long creep stages. Our results enhance our understanding of CRP evolution in G115 steel during creep and provide a guide for the design of novel heat-resistant steels with excellent creep strength. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

  • Details
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Type
research article
DOI
10.1016/j.actamat.2020.05.054
Web of Science ID

WOS:000552116400019

Author(s)
Xiao, Bo
•
Xu, Lianyong
•
Cayron, Cyril  
•
Xue, Jing
•
Sha, Gang
•
Loge, Roland  
Date Issued

2020-08-15

Publisher

PERGAMON-ELSEVIER SCIENCE LTD

Published in
Acta Materialia
Volume

195

Start page

199

End page

208

Subjects

Materials Science, Multidisciplinary

•

Metallurgy & Metallurgical Engineering

•

Materials Science

•

g115 steel

•

creep

•

precipitation

•

three-dimensional atom probe

•

coarsening mechanism

•

heat-resistant steel

•

mechanical-properties

•

strengthening mechanisms

•

plastic-deformation

•

welded-joint

•

laves phase

•

atom-probe

•

fe-cu

•

evolution

•

copper

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LMTM  
Available on Infoscience
June 19, 2021
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/179140
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