3D mapping of orientation variation and local residual stress within individual grains of pearlitic steel using synchrotron dark field X-ray microscopy

Assessing the local residual stress and orientation with nanometer resolution within embedded steel grains has remained challenging. Here we use an advanced synchrotron technique, dark field X-ray microscopy to map 3D lattice variations, including both crystallographic strain, two pro-eutectoid ferrite in pearlitic steel. We found variation up 0.5° compressive elastic strain 1.8 × 10?3 are present as-manufactured sample. There is no direct correlation between measured orientation. The origin of variations their influence on manufacturing process mechanical properties discussed.