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Effect of melting temperature on microstructural evolutions, behavior and corrosion morphology of Hadfield austenitic manganese steel in the casting process

查看全文 作　　者：Masoud [1]Sabzi;Sadegh Moeini [2]Far;Saeid Mersagh [3]Dezfuli 高影响力作者 机构地区：[1]Young Researchers and Elite Club, Dezful Branch, Islamic Azad University;[2]Department of Mechanical Engineering, Islamic Azad University;[3]Department of Materials Science and Engineering, Islamic Azad University高影响力机构 出　　处：《International Journal of Minerals,Metallurgy and Materials》索引2018年第25卷第12期,共8页高影响力期刊 摘　　要：In this study, the effect of melting temperature on the microstructural evolutions, behavior, and corrosion morphology of Hadfield steel in the casting process is investigated. The mold was prepared by the sodium silicate/CO_2 method, using a blind riser, and then the desired molten steel was obtained using a coreless induction furnace. The casting was performed at melting temperatures of 1350, 1400, 1450, and 1500°C, and the cast blocks were immediately quenched in water. Optical microscopy was used to analyze the microstructure, and scanning electron microscopy(SEM) and X-ray diffractrometry(XRD) were used to analyze the corrosion morphology and phase formation in the microstructure, respectively. The corrosion behavior of the samples was analyzed using a potentiodynamic polarization test and electrochemical impedance spectroscopy(EIS) in 3.5 wt% NaCl. The optical microscopy observations and XRD patterns show that the increase in melting temperature led to a decrease of carbides and an increase in the austenite grain size in the Hadfield steel microstructure. The corrosion tests results show that with increasing melting temperature in the casting process, Hadfield steel shows a higher corrosion resistance. The SEM images of the corrosion morphologies show that the reduction of melting temperature in the Hadfield steel casting process induced micro-galvanic corrosion conditions. 关 键 词：Hadfield steel casting process melting temperature MICROSTRUCTURAL EVOLUTIONS CORROSION BEHAVIOR CORROSION morphology
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