It is oftentimes said to be a distinctive metallographic trait that differentiates a fully austenitic and a fully felly ferritic steel without etching that might distinguish between two. Why twinning is easier in FCC than BCC? It is likely somehow related to packing efficiency of closest-packed planes in these two structures and might also related to stacking fault energy difference. Is my reasoning right? Please add to answer my question.
Did you think about carbon solubility in fcc relative to bcc and their relation to stacking fault energy ?
-There are not really stable stacking faults in bcc.
-Both fcc and bcc can twin under deformation. For ordinary bcc metals, it is even more relvant than for ordinary fcc, simply because slip is much easier in fcc than in bcc, especially at low temperature. Exception: TWIP steels
-The decisive difference is, however, recrystallisation twins, which tend to exist in fcc but do not exist in relevant quantities (not at all in bcc) simply due to the large difference in fault energy. What you typically see as is recrystallisation twins.
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