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10 In the framework of an extensive investigation regarding crack initiation and propagation during low-cycle fatigue in Duplex StainlessIn the framework of an extensive investigation regarding crack initiation and propagation during low-cycle fatigue in Duplex Stainless 11 Steels (DSS), the present study was focused on the fatigue surface damage in a low nitrogen DSS. The Coffin Manson curve is presentedSteels (DSS), the present study was focused on the fatigue surface damage in a low nitrogen DSS. The Coffin Manson curve is presented 12 for DIN W Nr. 1.4460 DSS and compared with that of a high nitrogen steel. The surface damage has been observed by optical and elec-for DIN W Nr. 1.4460 DSS and compared with that of a high nitrogen steel. The surface damage has been observed by optical and elec- 13 tronic microscopy and analysed in relation to the underlying dislocation structure by transmission electron microscopy. The results fortronic microscopy and analysed in relation to the underlying dislocation structure by transmission electron microscopy. The results for 14 the present low nitrogen steel DIN W Nr. 1.4460 show that, at Det = 0.8 · 102, the preferred site for short crack initiation seems to bethe present low nitrogen steel DIN W Nr. 1.4460 show that, at Det = 0.8 · 102, the preferred site for short crack initiation seems to be 15 the intense slip marks formed mostly in the ferrite and less frequently in phase boundary. On the contrary, at Det = 1.2 · 102, shortthe intense slip marks formed mostly in the ferrite and less frequently in phase boundary. On the contrary, at Det = 1.2 · 102, short 16 cracks form mostly in phase boundary.cracks form mostly in phase boundary. 17 2006 Published by Elsevier Ltd.2006 Published by Elsevier Ltd. 18 Keywords: Low-cycle fatigue; Crack nucleation; Microstructures; Stainless steelsKeywords: Low-cycle fatigue; Crack nucleation; Microstructures; Stainless steels