钛、硫对含锡16Mn钢中硫化物及组织的影响
首发时间:2018-10-12
摘要:利用真空感应炉冶炼了含不同硫、钛含量的含锡16Mn钢,为了研究钛、硫对含锡16Mn钢中硫化物夹杂形貌分布及显微组织的影响,以G2号钢为例进行MnS生成热力学计算,并进行相关观察统计分析工作。结果表明:G2实验钢中夹杂物类型主要为MnS及其复合夹杂,在含锡实验钢中,随着钢中钛和硫的加入,钢中夹杂数量呈上升趋势,面积占比也有所增加,小尺寸硫化物占比扩大。观察含锡钢的锻后组织,发现适当地加入钛和硫可起到细化均匀组织,增大钢中铁素体比例,对钢的性能有利;经热力学计算,发现MnS在凝固末期凝固分率约为0.9828时,实际活度积开始大于平衡活度积,满足热力学方面的形成条件。
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Effects of Titanium and Sulfur on the Sulfide and Microstructure of Tin - containing 16Mn steel
Abstract:The tin-containing 16Mn steel containing different sulfur and titanium was smelted by vacuum induction furnace. In order to research the influence of titanium and sulfur on the morphology and microstructure of sulfide inclusions in tin-containing 16Mn steel, taking G2 steel as an example, the thermodynamic calculation of MnS generation is carried out, and relevant observation and statistical analysis are carried out. The results show that the main type of inclusions in the G2 experimental steel is MnS and its composite inclusions. In the tin-containing experimental steel, with the addition of titanium and sulfur, the number of inclusions in the steel increases, and the area ratio also increases. The proportion of small size sulfides is enlarged. Observing the microstructure of the tin-containing steel after forging, it was found that the proper addition of titanium and sulfur can refine the microstructure and increase the proportion of ferrite in the steel, which is beneficial to the properties of the steel. By thermodynamic calculation, it is found that MnS is at the end of solidification, when the solidification fraction is about 0.9828, the actual activity product starts to be larger than the equilibrium activity product, which satisfies the thermodynamic formation conditions.
Keywords: Inclusion dimension distribution 16Mn steel Microstructures
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