低硫微合金钢中MnS析出及晶内铁素体形成研究  

Study on the precipitation behavior of MnS and the formation of intragranular ferrite in low sulfur micro-alloy steel

作　　者：朱立光[1] 梅国宏[1] 张庆军[1,2] 韩毅华[1] 

机构地区：[1]河北联合大学冶金与能源学院河北省高品质钢连铸工程技术研究中心,河北唐山063009 [2]河北联合大学分析测试中心,河北唐山063009

出　　处：《炼钢》2015年第2期54-58,共5页Steelmaking

基　　金：河北省自然科学基金资助项目(E2013209207)

摘　　要：采用真空感应炉冶炼Al-Si-Mn-Ti复合脱氧的低硫微合金钢，通过热力学计算对钢液凝固过程中MnS析出规律进行分析，运用带X射线能谱分析仪的场发射扫描电镜对夹杂物形貌、尺寸和成分以及MnS在复合氧化物上的析出形态进行分析。结果表明：MnS的析出主要受液相中Mn、S含量和液相温度控制。Mn-Si，Mn-Ti，Al-Mn-Ti，Al-Mn-Si复合氧化物都能作MnS析出的核心，MnS在硅锰氧化物表面呈镶嵌状析出，在钛锰氧化物表面呈包裹状析出，还可溶解在铝钛锰和铝硅锰氧化物的内部。诱发IGF形核的复合夹杂物尺寸为2～3μm。Low sulfur micro-alloy steel with A1-Si-Mn-Ti complex deoxidation was produced by vacuum induction furnace. Precipitation regularity of MnS was analyzed by thermodynamic calculation. The morphology, size and composition of inclusions and precipitation morphology of MnS on multiple oxide were studied by using FE-SEM with EDS. The results showed that the precipitation of MnS is mainly controlled by Mn and S contents and temperature of the steel. Mn-Si, Mn-Ti, Al-Mn-Ti and Al-Mn-Si com- plex oxides are all effective to be nucleation site for MnS. MnS takes on mosaic-like pre- cipitation at Si-Mn oxides surface and is encapsulated at Ti-Mn oxides surface. MnS can also be dissolved in Al-Ti-Mn and Al-Si-Mn oxides. The size of complex oxides that can induce formation of IGF is 2-3μm.

关 键 词：MNS 夹杂物 晶内铁素体 氧化物冶金 

分 类 号：TF701.2[冶金工程—钢铁冶金]