The origin of midrib in lenticular martensite

Akinobu Shibata, Toshio Murakami, Shigekazu Morito, Tadashi Furuhara, Tadashi Maki

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)

Abstract

In the present paper, the origin of midrib in lenticular martensite is clarified by examining the similarity between midrib and thin plate martensite in detail and studying the stress-induced growth behavior of thin plate martensite at various temperatures, Although lenticular martensite, especially midrib, exhibits a zigzag array in general, some martensite plates which are branched or kinked were also observed as thin plate martensite. The substructure of midrib is completely twinned and the orientation relationship of midrib with respect to austenite is close to Greninger-Troiano relationship. These morphology, substructure and crystallographic features of midrib in lenticular martensite are quite similar to those of thin plate martensite. Furthermore, stress-induced growth behavior of thin plate martensite changes with deformation temperature. Thermally-transformed thin plate martensite grows keeping a thin plate shape when deformed at temperature close to the Ms temperature. However, it grows into a lenticular shape accompanying a substructure with a high density of dislocations after deformation at temperature much higher than Ms temperature. Therefore, it is concluded that midrib in lenticular martensite is thin plate martensite itself. The difference between lenticular martensite and thin plate martensite is only in their growth behaviors.

Original languageEnglish
Pages (from-to)1242-1248
Number of pages7
JournalMaterials Transactions
Volume49
Issue number6
DOIs
Publication statusPublished - 2008 Jun

Keywords

  • Crystallographic features
  • Lenticular martensite
  • Midrib
  • Morphology
  • Stress-induced growth behavior
  • Substructure
  • Thin plate martensite

ASJC Scopus subject areas

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

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