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Highlights 1. This is the first study about the corrosion fatigue behavior of selective laser melted (SLM) biodegradable porous iron based on diamond unit cells. A novel test setup was developed that complemented the fatigue test machine and ensured that cyclic loading on the specimen could occur in circulated r-SBF at 37 o C.2. AM porous iron exhibited high fatigue resistance with fatigue strengths being 70% and 65% of yield stress in air and revised simulated body fluid (r-SBF), respectively.3. How biodegradation and cyclic loading affected each other were investigated at both macro and micro scales. The observed high fatigue strength and slow biodegradation rate underline the importance of AM porous iron as a promising bone-substituting material.