Investigation of Strain-Induced Martensitic Transformation in Metastable Austenite using Nanoindentation

Journal Article · Thu Dec 31 23:00:00 EST 2009 · Scripta Materialia

DOI:https://doi.org/10.1016/j.scriptamat.2010.05.024· OSTI ID:982401

Ahn, T. -H. ^[1]; Oh, C. -S. ^[2]; Kim, D. H. ^[1]; Oh, K. H. ^[1]; Bei, Hongbin ^[3]; George, Easo P ^[3]; Han, H. N. ^[1]

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1. Seoul National University
2. Korean Institute of Materials Science
3. ORNL

Strain-induced martensitic transformation of metastable austenite was investigated by nanoindentation of individual austenite grains in multi-phase steel. A cross-section prepared through one of these indented regions using focused ion beam milling was examined by transmission electron microscopy. The presence of martensite underneath the indent indicates that the pop-ins observed on the load-displacement curve during nanoindentation correspond to the onset of strain-induced martensitic transformation. The pop-ins can be understood as resulting from the selection of a favorable martensite variant during nanoindentation.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 982401
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 5 Vol. 63; ISSN 1359-6462
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUSTENITIC STEELS
ION BEAMS
MARTENSITE
MILLING
PHASE TRANSFORMATIONS
STRAINS