Effect of large inclusion on impact toughness of 12MDV6 casting
HUANG Yu1, CHENG Guo-guang1, WANG Qi-ming1, DOU Wen-zhe2, HU Xue-wen2
1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China; 2. Technology Center,Huoshan Foundry Co. , Ltd. , Yingliu Group, Liu′an 237200, Anhui, China
Abstract:Based on the unstable impact toughness of 12MDV6 casting during the actual production, the effect of large-size inclusions on the impact toughness of 12MDV6 casting was studied. The formation process of large-size inclusion was obtained by studying the characteristics of inclusions analyzed by SEM during the smelting process of 12MDV6 casting, and finally the corresponding improved process is proposed. The results are as follows. The large-size oxides, including Ca-Al-O+MgO, Al-O and Mg-Al-O, cause the unqualified impact toughness of 12MDV6 casting, which are mainly formed during the AOD process. The heavy addition of Al alloy to compensate for the insufficient temperature in the AOD process is the direct reason for the formation of large-size oxides. The improvement process mainly includes two aspects, one is to reduce the amount of Al alloy added in the AOD process, the other is to increase the mass fraction of elemental carbon and silicon at the end of the electric furnace. The impact energy of the casting is above 180 J after the process is improved, meeting the needs of users. And the improved process can realize efficient production.
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HUANG Yu, CHENG Guo-guang, WANG Qi-ming, DOU Wen-zhe, HU Xue-wen. Effect of large inclusion on impact toughness of 12MDV6 casting[J]. China Metallurgy, 2020, 30(6): 39-47.
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