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

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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.

Original languageEnglish
Pages (from-to)540-543
Number of pages4
JournalScripta Materialia
Volume63
Issue number5
DOIs
Publication statusPublished - 2010 Sep 1

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All Science Journal Classification (ASJC) codes

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

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