The morphology and crystallography of lath martensite in alloy steels

S. Morito, X. Huang, T. Furuhara, T. Maki, N. Hansen

Research output: Contribution to journalArticlepeer-review

486 Citations (Scopus)

Abstract

The morphology and crystallography of lath martensite in two Mn-containing interstitial free steels and a maraging steel were examined in detail by a combination of transmission electron microscopy, electron backscatter diffraction in a scanning electron microscope and optical microscopy. Indirect determination of the orientation relationship between the lath martensite and the austenite was made by analysis of misorientation distributions, and a similar orientation relationship was found for the three alloys in accordance with previous observations in low-carbon steels. Furthermore, the formation of six variants in a given packet and the preferential arrangement into blocks of low-misorientation variant pairs demonstrate a universality of morphology and crystallography of lath martensite. The presence of six variants in a packet can be accounted for by the minimization of the total shape strain introduced during the transformation. The lath boundaries developed within the volume of a certain variant show alternating misorientations and a mixed tilt and twist character characterizing these structures as low-energy dislocation structures.

Original languageEnglish
Pages (from-to)5323-5331
Number of pages9
JournalActa Materialia
Volume54
Issue number19
DOIs
Publication statusPublished - 2006 Nov

Keywords

  • Crystallography
  • EBSD
  • Lath martensite
  • Morphology
  • TEM

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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