Investigation of strain-induced martensitic transformation in metastable austenite using nanoindentation

T. H. Ahn; C. S. Oh; D. H. Kim; K. H. Oh; H. Bei; E. P. George; H. N. Han

doi:10.1016/j.scriptamat.2010.05.024

Investigation of strain-induced martensitic transformation in metastable austenite using nanoindentation

T. H. Ahn, C. S. Oh, D. H. Kim, K. H. Oh, H. Bei, E. P. George, H. N. Han

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

132 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	540-543
Number of pages	4
Journal	Scripta Materialia
Volume	63
Issue number	5
DOIs	https://doi.org/10.1016/j.scriptamat.2010.05.024
Publication status	Published - 2010 Sept

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2010.05.024

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abstract = "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.",

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AU - Ahn, T. H.

AU - Oh, C. S.

AU - Kim, D. H.

AU - Oh, K. H.

AU - Bei, H.

AU - George, E. P.

AU - Han, H. N.

PY - 2010/9

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N2 - 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.

AB - 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.

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JO - Scripta Materialia

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Investigation of strain-induced martensitic transformation in metastable austenite using nanoindentation

Abstract

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