Variant selection during mechanically induced martensitic transformation of metastable austenite by nanoindentation

Multiple pop-in events which indicate a gradual transformation from a metastable austenite grain to martensites in steel were detected during nanoindentation. It was observed by means of an automotive mapping technique with TEM that the partial volume of prior austenite had transformed into several...

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Bibliographic Details
Published in:Scripta materialia 2015-07, Vol.104, p.13-16
Main Authors: Kim, Yanghoo, Ahn, Tae-Hong, Suh, Dong-Woo, Han, Heung Nam
Format: Article
Language:English
Subjects:
Austenite
Automotive components
Martensite
Martensitic phase transformation
Martensitic transformations
Mathematical analysis
Metastable phases
Nanoindentation
Pop-in
Structural steels
Transformations
Transmission electron microscopy (TEM)
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Summary:Multiple pop-in events which indicate a gradual transformation from a metastable austenite grain to martensites in steel were detected during nanoindentation. It was observed by means of an automotive mapping technique with TEM that the partial volume of prior austenite had transformed into several martensite blocks with different variants. From a finite element calculation combined with phenomenological approach for martensitic transformation, it was confirmed that each variant corresponded to those for which the transformation strain effectively accommodates external stress.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2015.03.014