Abstract
The evolution of subsequent yield loci after large plastic strains has been studied for pure iron and steel with ferrite-pearlite structure. Large strains have been applied by torsion of thin walled tubes with different strain paths: monotonic and cyclic incremental torsion. Points on the yield loci have been probed by biaxial torsion-tension or torsion-compression load using a single-probe method. The results show strong influence of the microstructure towards anisotropic hardening. Microstrain values from XRD profile analysis are added and confirm the findings for hardening behaviour.
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