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Phase Transformation Crystallography of Lath Martensite

Published online by Cambridge University Press:  26 February 2011

Xiao Ma  and
R.C. Pond
Xiao Ma
Affiliation:
[email protected], The University of Liverpool, Department of Engineering, Brownlow Hill, Liverpool, L69 3GH, United Kingdom
R.C. Pond
Affiliation:
[email protected], The University of Liverpool, Department of Engineering, Brownlow Hill, Liverpool, L69 3GH, United Kingdom
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Abstract

Our current understanding of martensitic transformations has been based on the Phenomenological Theory of Martensite Crystallography developed in the 1950s. Recently, a Topological Model of martensitic transformations has been presented wherein the habit plane is a semi-coherent structure, and the transformation mechanism is shown explicitly to be diffusionless. This approach is used here to model phase transformation crystallography of lath martensite in ferrous alloys. A range of network geometries is predicted corresponding to orientation relationships varying from Nishiyama-Wasserman to Kurdjumov-Sachs. Experimental observations from the literature of the dislocation and disconnection arrays, habit plane and orientation relationship are in good agreement with the model.

Keywords

phase transformationmicrostructuretransmission electron microscopy (TEM)
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 979: Symposium HH – Thermodynamics and Kinetics of Phase Transformations in Inorganic Materials , 2006 , 0979-HH07-03
Copyright
Copyright © Materials Research Society 2007

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References

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