The morphology and crystallography of lath martensite in alloy steels

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 d...

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Bibliographic Details
Published in:Acta materialia 2006-11, Vol.54 (19), p.5323-5331
Main Authors: Morito, S., Huang, X., Furuhara, T., Maki, T., Hansen, N.
Format: Article
Language:English
Subjects:
Applied sciences
Crystallography
EBSD
Exact sciences and technology
Lath martensite
Metals. Metallurgy
Morphology
TEM
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Summary: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.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2006.07.009