Document Detail


Atom probe tomography investigation of lath boundary segregation and precipitation in a maraging stainless steel.
MedLine Citation:
PMID:  23234833     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Lath boundaries in a maraging stainless steel of composition 13Cr-8Ni-2Mo-2Cu-1Ti-0.7Al-0.3Mn-0.2Si-0.03C (at%) have been investigated using atom probe tomography following aging at 475°C for up to 100h. Segregation of Mo, Si and P to the lath boundaries was observed already after 5min of aging, and the amount of segregation increases with aging time. At lath boundaries also precipitation of η-Ni(3)(Ti, Al) and Cu-rich 9R, in contact with each other, takes place. These co-precipitates grow with time and because of coarsening the area number density decreases. After 100h of aging a ∼5nm thick film-like precipitation of a Mo-rich phase was observed at the lath boundaries. From the composition of the film it is suggested that the phase in question is the quasicrystalline R' phase. The film is perforated with Cu-rich 9R and η-Ni(3)(Ti, Al) co-precipitates. Not all precipitate types present in the matrix do precipitate at the lath boundaries; the Si-containing G phase and γ'-Ni(3)(Ti, Al, Si) and the Cr-rich α' phase were not observed at the lath boundaries.
Authors:
Mattias Thuvander; Marcus Andersson; Krystyna Stiller
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-17
Journal Detail:
Title:  Ultramicroscopy     Volume:  -     ISSN:  1879-2723     ISO Abbreviation:  Ultramicroscopy     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-12-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7513702     Medline TA:  Ultramicroscopy     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier B.V. All rights reserved.
Affiliation:
Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden. Electronic address: mattias.thuvander@chalmers.se.
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