Nanoscale austenite reversion through partitioning, segregation and kinetic freezing: Example of a ductile 2 GPa Fe-Cr-C steel

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Austenite reversion during tempering of a Fe-13.6 Cr-0.44 C (wt.%) martensite results in an ultra-high-strength ferritic stainless steel with excellent ductility. The austenite reversion mechanism is coupled to the kinetic freezing of carbon during low-temperature partitioning at the interfaces between martensite and retained austenite and to carbon segregation at martensite martensite grain boundaries. An advantage of austenite reversion is its scalability, i.e. changing tempering time and temperature tailors the desired strength-ductility profiles (e.g. tempering at 400 degrees C for 1 min produces a 2 GPa ultimate tensile strength (UTS) and 14% elongation while 30 mm at 400 degrees C results in a UTS of similar to 1.75 GPa with an elongation of 23%). The austenite reversion process, carbide precipitation and carbon segregation have been characterized by X-ray diffraction, electron back-scatter diffraction, transmission electron microscopy and atom probe tomography in order to develop the structure-property relationships that control the material's strength and ductility. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2012-04
Language
English
Article Type
Article
Keywords

DEFORMATION-INDUCED MARTENSITE; ATOM-PROBE TOMOGRAPHY; SUPERMARTENSITIC STAINLESS-STEEL; MECHANICAL-PROPERTIES; REVERTED AUSTENITE; TEMPERING PROCESS; LATH MARTENSITE; HEAT-TREATMENT; CARBON; TRANSFORMATION

Citation

ACTA MATERIALIA, v.60, no.6-7, pp.2790 - 2804

ISSN
1359-6454
DOI
10.1016/j.actamat.2012.01.045
URI
http://hdl.handle.net/10203/207078
Appears in Collection
MS-Journal Papers(저널논문)
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