含镁硫系易切削钢体系夹杂物析出热力学分析
Thermodynamic Analysis of Inclusion in Sulfur Free-Cutting Steel by Magnesium Treatment
DOI: 10.12677/MEng.2018.53016, PDF,    国家自然科学基金支持
作者: 张庆松, 闵 义, 许海生, 许久健, 刘承军：东北大学，多金属共生矿生态化冶金教育部重点实验室，辽宁 沈阳
关键词: 镁处理；硫系易切削钢；夹杂物；热力学；Magnesium Treatment； Free-Cutting Steel； Inclusion； Thermodynamics
摘要: 为探究硫系易切削钢中镁处理控制夹杂物的可行性，本文从热力学上分析了Mg加入量对钢液成分及析出相的影响。热力学计算结果显示，Mg-Si-Mn-O-S钢液体系在1600˚C时的平衡相包括MgO-SiO2-MnO、2MgO∙SiO2、MgO和MgS。硫系易切削钢Si-Mn脱氧后进行镁处理，随着Mg加入量的提高，夹杂物的生成顺序为SiO2-MnO(l)或SiO2(s) → MgO-SiO2-MnO(l) → 2MgO∙SiO2(s) → MgO(s) → MgS(s)。精准控制钢中镁含量是硫系易切削钢镁处理的关键，若钢液中S含量为0.2%时，当控制钢液中溶解Mg含量低于0.0012%时，镁处理只变质氧化物夹杂；当控制钢液中溶解Mg含量高于0.0012%时，硫化物夹杂变质。
Abstract: In order to explore the feasibility of magnesium treatment in sulfur free-cutting steel, the effect of magnesium addition on the composition of molten steel and inclusion is analyzed thermodynami-cally by thermodynamic software FactSage. The calculation results show that the equilibrium pre-cipitations of Mg-Si-Mn-O-S steel system at 1600˚C are MgO-SiO2-MnO, 2MgO•SiO2, MgO and MgS. With the increase of magnesium addition in Si-Mn killed sufur free-cutting steel, the formation order of inclusion is SiO2-MnO(l) or SiO2(s) → MgO-SiO2-MnO(l) → 2MgO•SiO2(s) → MgO(s) → MgS(s). If the dissolved Mg in steel with 0.2% S is controlled below 0.0012%, only oxide inclusion is modified, while sulfide inclusion precipitates from the steel when the dissolved Mg is higher than 0.0012%.
文章引用：张庆松, 闵义, 许海生, 许久健, 刘承军. 含镁硫系易切削钢体系夹杂物析出热力学分析[J]. 冶金工程, 2018, 5(3): 115-121. https://doi.org/10.12677/MEng.2018.53016

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