Effect of magnesium on microstructure and properties of 440C stainless bearing steel melted under pressurized conditions
作者机构：School of MetallurgyNortheastern UniversityShenyang 110819LiaoningChina
出 版 物：《Journal of Iron and Steel Research(International)》 (钢铁研究学报（英文版）)
年 卷 期：2023年第30卷第4期
页 面：808-824页
核心收录：
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：the National Natural Science Foundation of China(Nos.U1760206 and 52074075)
主 题：Magnesium Bearing steel Inclusion Carbide Corrosion resistance
摘 要：The effects of magnesium(Mg)on the microstructure and properties of 440C stainless bearing steel melted under pressurized conditions were *** Mg improved the cleanliness of molten steel,modified the inclusions in steel,enhanced the distribution of carbides,and improved the mechanical properties and corrosion resistance of experimental *** detail,the contents of TO,S,and N in steel decreased from 0.0013 to 0.0003 wt.%,from 0.0032 to 0.0018 wt.%and from 0.0088 to 0.0049 wt.%,*** addition,the transformation order of oxide inclusions in steel is Al_(2)O_(3)→MgO∙Al_(2)O_(3)→MgO,where the content of Mg in steel sharply increased from 0.00 to 29×10^(-4),81×10^(-4),and 160×10^(-4)wt.%,and the transformation order of S-containing inclusions in steel is MnS→Mg–S–Mn(–MgO)→Mg–O–***,the number and size of inclusions and the proportion of large-size inclusions in steel decreased ***,the network structure of carbides in steel collapsed,the size of carbides was reduced,and the distribution was more ***,the tensile strength,impact toughness,and pitting corrosion resistance of the experimental steel were significantly improved.
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