电磁搅拌电流对铸态TiB_(2)颗粒增强建筑结构钢性能的影响

Effect of Electromagnetic Stirring Current on the Properties of As-Cast TiB_(2) Reinforced Structural Steel

为了提高建筑结构钢的性能,采用添加TiB_(2)颗粒的方式对其加强。分析立式电磁搅拌模式下电流对其微观组织及力学性能的影响,同时研究了强对流状态下的颗粒分布形态。研究结果表明:经电磁搅拌处理后,形成了相近的X射线衍射曲线。随着电流增加,初生TiB_(2)颗粒数量明显增加,表明电磁搅拌作用对细化试样中的TiB_(2)颗粒具有明显效果。当电流提高后,TiB_(2)初生相颗粒平均粒径发生了降低。高度增大后,硬度也随之升高,存在由于重力因素产生的宏观偏析情况。经电磁搅拌处理后,各高度处硬度更加接近,获得更均匀的硬度分布状态。以100 A电流制得的试样拉伸强度为451 MPa,相对于无搅拌条件下的拉伸强度提高了72%。提高电流后,合金的拉伸强度和伸长率获得了提升。

In order to improve the properties of building structural steel, TiB_(2) particles were added to strengthen it. The effect of electric current on the microstructure and mechanical properties of vertical electromagnetic stirring was analyzed, and the particle distribution under strong convection was studied. The results show that the XRD curves are similar after the electromagnetic stirring treatment. With the increase of electric current, the number of primary TiB_(2) particles increases significantly, indicating that electromagnetic stirring has an obvious effect on refining TiB_(2) particles in the sample. The average particle size of the TiB_(2) primary phase decreases when the current increases. When the height increases, the hardness also increases, and there is macroscopic segregation caused by gravity. After electromagnetic stirring treatment, the hardness at each height is closer, and the hardness distribution is more uniform. The tensile strength of the sample prepared with 100 A current is 451 MPa, which is 72% higher than that without stirring. After increasing the current, the tensile strength and elongation of the alloy are improved.