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Investigations with transmission electron microscopy and X-ray line profile analysis on a plain carbon steel Ck 45 (SAE 1045) in a normalized state are carried out to characterize the influence of strain rate and temperature on the microstructure after plastic deformation. With increasing strain rate at constant strain typical variations of the dislocation arrangements are observed, but the dislocation densities are not changed. Similar dislocation arrangements occur after high strain rate deformation at room temperature and low temperature deformation at low strain rates. Using the X-ray line profile analysis it becomes obvious that the internal microresidual strains and stresses, respectively, increase with increasing strain rate and decreasing temperature due to the dislocation arrangement

MICROSTRUCTURAL INVESTIGATIONS OF HIGH STRAIN RATE DEFORMED STEEL USING TRANSMISSION ELECTRON MICROSCOPY AND X-RAY LINE PROFILE ANALYSIS