Abstract
Complex loading conditions are typical for structural materials, especially for steels. Fatigue crack propagation measurements during bend loading were carried out with different load ratios on a newly developed weathering steel KT 315 Si. This steel indicates an improved corrosion resistance in comparison with the weathering steel KT 315. Scanning electron microscopy of the fracture surfaces and quantitative microstructure analysis by means of light microscopy were applied to elucidate relations between microstructure and mechanical properties. An important result of the investigation is that the steel KT 315 Si reveals a lowered mean stress sensitivity of the fatigue threshold value ΔK th in comparison with that of other ferritic-pearlitic steels of the same strength level
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