Effects of Hot Processing on Sulfide and Oxide Inclusions
ZHENG Hao1, LIU Lihua2, ZHANG Zhongwu1,*
1 College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150000, China 2 Nanjing Iron & Steel Co., LTD, Nanjing 210035, China
Abstract: With the development of industry, higher and higher requirements are set on the quality of steels. Inclusions are one of the most important factors that affect the quality of steels. Especially for high-strength steels, the toughness is more sensitive to inclusions. Therefore, it is an important topic to investigate the effects of processing parameters on inclusion evolution during smelting, hot rolling and heat treatment processes. Inclusions have a significant impact on all the strength, plastic, toughness, fatigue resistance and corrosion resistance of steels. To reduce the disadvantageous effects of inclusions on the properties of steels, updating and optimizing the smelting methods are the prerequisite. With the application of bubble removal technology, vacuum carbon deoxidation technology, and tundish electromagnetic stirring technology in the smelting process, the contents of inclusions in steels have been significantly reduced. However, in the current industrialized environment, it is still impossible to eliminate non-metallic inclusions completely in steels. Some research results have shown that hot rolling and heat treatment processes also have an important influence on the evolution of inclusions, which is of great significance to further control the size, distribution and morphology of the inclusions after smelting. Therefore, in addition to the development of new smelting processes to reduce the content of inclusions, Clarifying the effects of hot processing on the evolution of inclusions is another important research direction. In this paper, the advanced inclusion control technologies and their principles in the smelting process are summarized first. The effects of thermomechanical processing and heat treatment on the number, size, distribution, morphology, and types of inclusions are then reviewed carefully.
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