Effect of Pearlite Structure on Corrosion Behavior of U71Mn Heavy Rail Steel
WU Shijie1, LIU Lixia1,2, PENG Jun1,2, WANG Xiaoli2, JIAO Haidong1,2, HUO Qinan3
1 School of Materials and Metallurgy, Inner Mongolia University of Science and Technology,Baotou 014010, China 2 Inner Mongolia Key Laboratory ofAdvanced Ceramics and Devices, Baotou 014010, China 3 Shougang Jingtang Iron and Steel United Co., Ltd.,Tangshan 063000, China
Abstract: The corrosion behaviors of U71Mn heavy rail steel with different perlite lamellar spacing were studied by accelerated corrorsion test in simulated atmopheric environment. The microstructure and corrosion results of heavy rail steel were measured by FESEM, XRD and electrochemical measurement. The pearlite interlaminar spacing of U71Mn heavy rail steel under different cooling way were 155 nm, 241 nm, 340 nm and 446 nm. The corrosion weight loss and corrosion rate decreased significantly with the decrease of pearlite interlaminar spacing. When the pearlite lamellar spacing was 155 nm, the corrosion rate was the lowest, which was 0.001 4 mg·cm-2·h-1. There were α-FeOOH, γ-FeOOH and Fe3O4 in the rust layer of 4 samples. When the pearlite lamellar spacing was less than 241 nm, the peak value of α-FeOOH was obviously enhanced, and a small amount of α-Fe2O3 appeared in the corrosion products, and the rust layer was relatively dense. The formation time of dense rust layer was 120 h earlier than 240 h, and the thickness and compactness of the inner rust layer were obviously improved when the pear-lite lamellar spacing decreased from 446 nm to 155 nm. The corrosion current density was minimun and corrosion potential was maximum when the pearlite interlaminar spacing was 155 nm after 480 hours of corrosion, which had the best resistance to atmospheric corrosion.
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2021, Vol. 35 
