Abstract
The high-voltage electron microscope, adapted for high temperature operation, has been used to study the dynamic response and structure of ferrite-austenite interfaces in dilute Fe-C-Mo and Fe-C alloys. The interfaces were found to fall into two classes comprising: Smooth highly mobile interfaces that responded to thermal transients without apparent hesitation or hysteresis; and facetted less mobile interfaces that moved by the lateral migration of ledges. These latter interfaces linked ferrite and austenite crystals of simple mutual orientation relationships. These observations therefore provide direct evidence that there exists, at high temperatures, and under growth conditions, a structurally determined anisotropy of interfacial mobility, sufficient to play a major role in the development of proeutectoid ferrite morphology.
Published Version
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