How do we differentiate ferrite and martensite in xrd?
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Electron Backscatter Diffraction (EBSD) has proven useful for characterizing the crystallographic aspects of microstructure in steel. It is well suited to differentiating some phases in steels such as austenite and ferrite. However, other constituent phases such as bainite, martensite, cementite and pearlite are considerably more difficult. These difficulties arise because of the similarity in crystallographic structure between constituent phases. For example, martensite is body-centered tetragonal. Martensite typically has a c/a ratio of approximately 1.04 (the c/a ratio varies with carbon content). This is very close to a standard body-centered cubic structure where the c/a ratio is exactly one. This similarity in crystal structure makes it difficult to differentiate martensite from ferrite based using individual EBSD patterns. This work explores different EBSD image quality based approaches for automated differentiation of martensite from ferrite.
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