Abstract

This study nanostructured high alloy steel using repeated cold rolling (RCR). Full annealing was performed on high alloy steel sample of 6.5 mm thickness in order to have grains uniformity. The high alloy steel plate was heated to 900oC and furnace cooled after being soaked for 30 minutes. The samples were cut into two sections A and B and then cold rolled in an electric rolling machine to a size reduction of 38 and 54 %, respectively. The samples were subjected to mechanical (hardness, impact and wear), scanning electron microscopic, and X-ray diffraction examinations. There were significant increases in the hardness of A and B (19 and 47 %); (reduction in izod impact (2.1 and 6.9 %); increase in wear coefficient (1.3 and 8.8 %) as well as wear rate reduction (15.2 and 25.5 %) of the steel samples after repeated cold rolling. The SEM images showed phase changes after nanostructuring. The XRD confirmed the reduction to nano size with repeated rolling as the mean grain size at 38 and 54 % reductions were 15.47 and 13.25 nm, respectively

Copyright of the paper named above is hereby assigned and transferred to the Nigerian Journal of Applied Science and Innovative Technology published by College of Engineering, Bells University of Technology, Nigeria.