Abstract
This paper researched the fatigue failure mechanism of 2205 duplex stainless steel (DSS) by neutron diffraction and electron back-scattered diffraction measurement (EBSD) in mesoscopic scale. The results show that the fatigue strength of DSS is rather larger than single-phase stainless steel. The austenite is prone to deform due to mechanical properties difference between ferrite and austenite, and the transgranular and intergranular fracture mode is in austenite grains while the transgranular is mainly in ferrite grains. The relationship between macroscopic fracture and microscopic deformation is clarified by evolutions of kernel average misorientation (KAM), grain size and textures of ferrite and austenite.
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