电磁场对改善钢材质量的作用

Improving Steel Quality by Electromagnetic Field

研究了电磁制动技术对结晶器内钢液流动及夹杂物迁移行为的作用 ,以及电磁搅拌和电磁超声波对钢材料凝固组织的影响。研究结果表明 ,在恒稳电磁场作用下 ,钢液内形成的与钢液流动相反的电磁力可有效地控制钢液流动、稳定液面波动 ,有利于夹杂物的去除 ;在电磁搅拌和电磁超声波的作用下 ,金属的凝固组织得到细化 ,等轴晶比率明显提高。计算了磁场对奥氏体 /铁素体及铁素体 /奥氏体平衡边界的影响 ,磁场对相图的奥氏体 /铁素体界限产生很大影响 ,使其向高成分或高温度区域移动 ;随成分不同 ,磁场每增加 1T,钢的 Ae3温度升高 2～ 3℃。研究了电场奥氏体化对中碳合金钢 4 0 Mn Mo V性能的影响 ,与常规工艺处理样品相比 ,电场奥氏体化可使其硬度值升高 。

The flow of molten steel and movement of inclusions in the mold with electromagnetic braking, and influence of electromagnetic stirring and electromagnetic ultrasonic waves on the solidification structure of billet, were investigated, the results show that the flow of molten steel is effectively controlled by the opposite electromagnetic force, and the liquid surface is steady, that is beneficial to the removal of inclusions The solidification structure is refined and the ratio of equiaxial zone is apparently increased The calculated effect of magnetic fields on equilibrium of austenite/ferrite and ferrite/austenite phase boundaries shows that magnetic field makes the boundaries move to the higher carbon content or higher temperature side The Ae 3 temperature can be raised by 2 3 ℃ per one tesla depending on the carbon content Moreover, the influence of austenitization under electric field on the mechanical properties of 40MnMoV steel was investigated, the results show that the samples heat treated under electric field has higher microhardness, impact ductility and tensile strength