Abstract
The effects of changes in strain path on the plastic properties of steel sheet have been examined for plain carbon, rephosphorised and dual phase steels. All showed similar behaviour. A Bauschinger effect was observed in some cases but more commonly the pre-strain produced a latent hardening phenomenon. This increase in flow stress together with a reduction in work hardening rate leads to severely reduced ductility. The effect is attributed to changes in the dislocation substructure and is shown to be greatest if the two states of deformation are nearly orthogonal when described by vectors in strain-space.
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