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向钢液中喷吹微细金属氧化物颗粒,是一种获得良好强韧性的新的弥散强化工作。本文研究喷吹Al_2O_3、ZrO_2对低碳钢强韧性的影响。主要结果如下:1、喷吹金属氧化物具有细化钢的晶粒的作用,喷吹后钢的晶粒直径为正常钢的1/3～1/4。2、喷吹金属氧化物使钢的屈服强度增加10～15kg/mm~2,屈服强度与晶粒平均直径之间关系符合Hall—Petch公式。3、喷吹后,500℃钢的持久强度增加2—5 kg/mm~2,持久时间延长5～10倍。 4、改善钢的断口,提高冲击韧性,显著地降低钢的韧一脆转变温度,从0℃(正常钢)降低到-46℃,扫描电镜观察结果表明,钢的断口形态由解理状变为韧窝状。关于氧化物改善钢的强韧化机理,本文也作了初步探讨。
Spraying fine metal oxide particles into the molten steel is a new dispersion strengthening work that achieves good toughness. This paper studies the injection of Al 2 O 3 and ZrO 2 on the toughness of mild steel. The main results are as follows: 1, the metal oxide spray has the effect of grain refinement of steel, after injection of steel grain diameter of normal steel 1/3 ~ 1 / 4.2, blowing metal oxide steel The yield strength increases by 10 ~ 15kg / mm ~ 2, and the relationship between yield strength and average grain diameter conforms to the Hall-Petch formula. 3, after blowing, the lasting strength of 500 ℃ steel increased 2-5 kg / mm ~ 2, lasting 5 to 10 times longer. 4, to improve the fracture of the steel, improve the impact toughness, significantly reduce the ductile brittle transition temperature from 0 ℃ (normal steel) to -46 ℃, scanning electron microscopy results show that the fracture morphology of the steel by the cleavage deformation For the dimple-shaped. On the oxide to improve the toughening mechanism of steel, this article also made a preliminary discussion.