Microstructural Evolution of SK85 Pearlitic Steel Deformed by Heavy Cold Rolling

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Abstract

The microstructural evolution of SK85 pearlitic steel cold-rolled up to a 90% rolling reduction was characterized by scanning electron microscopy with electron backscattered diffraction (EBSD) and X-ray diffraction (XRD). SK85 steel exhibits excellent cold rolling performance. The interlamellar spacing of pearlite is refined obviously and a tensile strength of 2318 MPa can be reached for SK85 steel after 90% rolling reduction, an increase of 83% from 1264 MPa before rolling. The EBSD observation indicates that the {001} <110> texture becomes pronounced at a 90% rolling reduction in cold-rolled Sk85 steel. A propagation and multiplication of dislocations occur during rolling as the kernel average misorientation (KAM) angles significantly increase from 0.72° to 2.11°. The XRD analysis reveals that bcc ferrite is transformed into a bct structure at a 90% rolling reduction. The strengthening mechanism was discussed.

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Yang, C. D., Liu, Y., Zhou, G. Y., Zou, X. L., Lu, X. G., & Cao, G. H. (2022). Microstructural Evolution of SK85 Pearlitic Steel Deformed by Heavy Cold Rolling. Materials, 15(23). https://doi.org/10.3390/ma15238405

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