Adeleke, A.AIkubanni, P.P.Orhadahwe, T.AAweda, J.O.Odusote, J.K.Agboola, O.O.2019-10-312019-10-312019http://hdl.handle.net/123456789/3262Journal ArticleThis research was aimed at using image analysis to describe the effects of rapid cyclic heating on mild steel. AISI1021 steel sample used in this study was subjected to quenching heat treatment followed by 1, 2, 3, and 4-cycles of rapid heat treatment. The as-treated steel samples were characterized by Brinell hardness tests, Charpy Vnotch impact tests, optical microscopy, and image analysis using Image J software. The results revealed that the grain size decreased from 1.07 µm in the control sample to 0.79 µm in the third cycle sample and increased to 0.86 µm in the fourth cycle sample. However, the results revealed that two-cycles of rapid heat treatment was enough to produce ultra-fine grains and impact ductility in mild carbon steel.enMechanical propertiescollapsed buildingsteel rodschemical compositionspercentage elongationArticle