Elementary fatigue deformation mechanisms in duplex stainless steel bicrystals are studied by transmission electron microscopy (TEM). Attention is paid to the interaction between lattice dislocations and ferrite/austenite interfaces depending upon the orientation relationship (plastically compatible or incompatible) and the initial deformation (in the α-phase or in the γ -phase). Furthermore, an attempt is made to understand the behaviour under mechanical solicitation of each phase in the bicrystal and to compare it with the single crystal deformation behaviour.
Elementary mechanisms of deformation by fatigue in duplex stainless steels bicrystals are studied by transmission electron microscopy (TEM). An attempt is made to correlate the bicrystal macroscopic behaviour with the interphase interface crystallography.
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