炼钢 ›› 2015, Vol. 31 ›› Issue (2): 54-58.

• 试验研究 • 上一篇    下一篇

低硫微合金钢中MnS析出及晶内铁素体形成研究

  

  1. (河北联合大学1.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.分析测试中心,河北 唐山 063009)
  • 接受日期:1900-01-01 出版日期:2015-04-05

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

  • Accepted:1900-01-01 Online:2015-04-05

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2~3 μm。

关键词: MnS, 夹杂物, 晶内铁素体, 氧化物冶金

Abstract: Low sulfur micro-alloy steel with Al-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 complex oxides are all effective to be nucleation site for MnS. MnS takes on mosaiclike precipitation 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 2-3 μm.

Key words: MnS, inclusions, intragranular ferrite, oxide metallurgy