A quantitative relationship between ow stress and microstructure is studied for pearlitic steels incorporating 0 . 39 -0 . 77 wt-% carbon. The distribution of true lamellar spacing (S 0 ) is determined. It is found that S 0 depends on carbon concentration and pearlite transformation temperature accompanying a considerable distribution. The 0 . 2% proof stress is described as a function of the averaged S 0 but the in uence of the accuracy in S 0 measurement precludes satisfactory prediction of the 0 . 2% proof stress. High work hardening corresponds to the generation of phase stress caused by mis t plastic strain between ferrite and cementite. The stress partitioning behaviour between ferrite and cementite is veri ed by in situ neutron diffraction during tensile deformation.
MST/5782Professor Tomota, Mr Watanabe and Mr Kanie are in the
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