Microstructure and Properties of Pearlitic Steel during Cold Wire Drawing: A Residual Stress Perspective

摘要

The residual stress evolution during cold drawing of pearlitic steel wire was followed over a broad strain range by diffraction techniques. The present work discusses possible links between microstructural changes induced by severe deformation and their "footprints" left in the residual stresses on different - macro, micro and nano - scale levels. Energy dispersive synchrotron diffraction revealed a significant divergence in the grain microstress evolution among differently oriented ferrite grains in the high deformation regime beyond an accumulated true strain of about ε_t ≥ 2.3. A possible physical reason for the observed divergence is discussed in terms of a distinct micro-structure development in this stage of the cold wire drawing.