Microstructural changes in high strength steels exposed to large deformation and high strain rates

TL;DRAbstract

Increasing steel prices and environmental aspects have put forward the demand to reduce material consumption and energy usage in manufacturing industry and near-net-shape manufacturing techniques have thus become increasingly important. High-velocity parting-off,high-velocity forming and cold ring rolling are three such manufacturing methods that exhibit great potentials in terms of material waste reduction. However, all three processes involve large degrees of deformation that is not homogeneously distributed in the samples and the scientific knowledge regarding deformation mechanisms active in these processes is low. In order to allow for process optimisations a thorough understanding of associated deformation behaviour and microstructural changes is needed. Three steels have been used in this work: two bearing steels and one carbon steel.Through studies employing high-velocity parting-off incorporating impact velocities of 5-285 m/s, the fracture mechanisms active during material se

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