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由于镁对钢的脱氧、脱硫、净化钢水及转变夹杂物形态的良好作用,近年来许多冶金工作者致力于加镁精炼钢水的研究工作,但因在冶金温度下镁的蒸汽压很高,而其在钢水的溶解度又极小,加入困难,这方面的研究多归于失败。本文利用阿亨大学热力学数据库计算了以氩作为载气喷镁的脱氧、脱硫作用,以及压力和氩量对其影响,通过实验制定了行之有效的喷吹工艺,选择了合适的控制参数。 在1-3大压下,氩量为0.1-0.3N.L/m:n,可以向钢水成功地喷入镁。经过镁精炼的钢水,氧含量可降至4ppm,硫含量降至10ppm,氧化物及硫化物的评级均为0级,其尺寸均在5μm之下。随着喷镁量的增加(钢水重量的0.062至％0.56％),夹杂物中镁的氧化物及硫化物量增加,夹杂物总量减少且呈球形,此种夹杂物在热形变中不变形。因此在通常材料中所存在的各向异性完全消失,特别是缺口冲击韧性横向性能值提高了2～3倍。文章对材料在不同温度下的冲击韧性、过渡温度及断口夹杂物的形态进行了研究和论述。
In recent years, many metallurgists are devoted to the research work on magnesium refining and refining of molten steel due to the good effect of magnesium on the deoxidation, desulfurization, purification of molten steel and the transformation of inclusions. However, due to the high vapor pressure of magnesium at the metallurgical temperature , And its solubility in molten steel is extremely small, difficult to join, most of the research in this regard failed. In this paper, the effect of deoxygenation and desulfurization with magnesium as carrier gas injection magnesium and the effect of pressure and argon content on the magnesium were calculated by using the thermodynamic database of Acheng University. The effective injection process was established through experiments and the appropriate control parameters were selected. In 1-3 large pressure, the amount of argon is 0.1-0.3N.L / m: n, can be successfully injected into the molten steel magnesium. After the magnesium refining of molten steel, oxygen content can be reduced to 4ppm, sulfur content down to 10ppm, oxide and sulfide rating are 0, the size of 5μm below. With increasing magnesium content (0.062 to 0.56% of the weight of the molten steel), the amount of magnesium oxides and sulfides in inclusions increased, the total amount of inclusions decreased and became spherical, and the inclusions did not deform during thermal deformation. Therefore, the anisotropy existing in the usual materials completely disappears, especially the notch impact toughness transverse performance value increased by 2 to 3 times. In this paper, the impact toughness, transition temperature and morphology of inclusions at different temperatures were studied and discussed.