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The morphology and crystallography of lath martensite in alloy steels
- Source :
-
Acta Materialia . Nov2006, Vol. 54 Issue 19, p5323-5331. 9p. - Publication Year :
- 2006
-
Abstract
- 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. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 13596454
- Volume :
- 54
- Issue :
- 19
- Database :
- Academic Search Index
- Journal :
- Acta Materialia
- Publication Type :
- Academic Journal
- Accession number :
- 22797491
- Full Text :
- https://doi.org/10.1016/j.actamat.2006.07.009