Segregation engineering enables nanoscale martensite to austenite phase transformation at grain boundaries: A pathway to ductile martensite

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In an Fe-9 at.% Mn maraging alloy annealed at 450 degrees C reversed allotriomorphic austenite nanolayers appear on former Mn decorated lath martensite boundaries. The austenite films are 5-15 nm thick and form soft layers among the hard martensite crystals. We document the nanoscale segregation and associated martensite to austenite transformation mechanism using transmission electron microscopy and atom probe tomography. The phenomena are discussed in terms of the adsorption isotherm (interface segregation) in conjunction with classical heterogeneous nucleation theory (phase transformation) and a phase field model that predicts the kinetics of phase transformation at segregation decorated grain boundaries. The analysis shows that strong interface segregation of austenite stabilizing elements (here Mn) and the release of elastic stresses from the host martensite can generally promote phase transformation at martensite grain boundaries. The phenomenon enables the design of ductile and tough martensite. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2013-09
Language
English
Article Type
Article
Keywords

ATOM-PROBE TOMOGRAPHY; LOW-CARBON STEEL; TRANSMISSION ELECTRON-MICROSCOPY; LOW-ALLOY STEEL; MN-NI STEEL; FE-C ALLOYS; STAINLESS-STEEL; LATH MARTENSITE; REVERSE TRANSFORMATION; MECHANICAL-PROPERTIES

Citation

ACTA MATERIALIA, v.61, no.16, pp.6132 - 6152

ISSN
1359-6454
DOI
10.1016/j.actamat.2013.06.055
URI
http://hdl.handle.net/10203/207056
Appears in Collection
MS-Journal Papers(저널논문)
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