摘要: Abstract The crystallography and morphology of proeutectoid grain boundary cementite precipitates were studied in an isothermally transformed Fe-1.3%C-12%Mn steel. Grain develop with complex variations a that can be described as fern-like dendrites growing preferentially within along austenite boundaries. dendritic was made most readily apparent by deep etching specimens the alloy whose growth had been arrested after relatively short times during solid state austenite→cementite transformation. Trace analysis revealed these usually have no crystallographically preferred primary or secondary dendrite arm directions. Electron Backscattered Diffraction pattern showed approximated one known cementite–austenite crystallographic orientation relationships (OR) at least its adjacent grains. Occasionally, exhibited OR achieved ‘best fit’ directions between both
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