Effect of interlamellar spacing on the monotonic behavior of C70 pearlitic steel

摘要

The effect of interlamellar spacing on monotonic behavior of C70 pearlitic steel was investigated. Tensile tests under X-ray diffraction coupled with self-consistent model have been used to identify the role of interlamellar spacing on the ferrite plasticity parameters and residual stresses. It has been established that yielding of pearlite is controlled by ferrite critical shear stresses (τ_c~0(α)) which is higher for the smallest interlamellar spacing. Moreover, the residual stress level in ferrite is higher for the largest interlamellar spacing under the same imposed total strain. Lattice strains, measured by synchrotron X-ray diffraction, show elastic and plastic anisotropy of ferrite crystallites and high stresses in cementite which confirm the self consistent model calculation.