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通过对试验钢水中硫化物夹杂的观察和析出机理进行分析,结果表明:试验钢水中的硫化物夹杂大部分是以氧化物为核心析出的MnS,也有纯MnS,这些MnS在生产过程和凝固过程都不能自发生成,只有当钢液凝固后温度继续降低到886℃以下时硫化锰夹杂才开始以氧化物夹杂为核心进行析出;高温共聚焦固溶实验研究表明,随温度的升高,条状的夹杂物逐渐变宽,端部发生球化,温度升到700℃时,开始出现奥氏体晶界,并且随温度的升高,奥氏体晶粒不断长大,最后在晶界接触到夹杂物后才停止长大;夹杂物的面积先随温度的增加而增大,1 300℃保温时,随着硫、锰的固溶扩散,面积逐渐减小,最后只剩下氧化物夹杂,这进一步说明MnS夹杂是凝固后析出的。
Through the analysis of the sulfide inclusions in the molten steel, the results show that most of the sulfide inclusions in the molten steel are MnS precipitated with oxides and pure MnS. These MnS are not only in the process of production and solidification Can not happen spontaneously. Only when the temperature of the molten steel continues to drop below 886 ℃ after the solidification of the molten steel, the inclusions of the manganese sulfide begin to precipitate with the oxide inclusions as the core. High temperature confocal solid solution experiments show that with the increase of the temperature, Of the inclusions gradually widen, the end of the ball occurs, the temperature rose to 700 ℃, began to appear austenite grain boundaries, and with increasing temperature, austenite grains continue to grow, and finally in the grain boundary contact Inclusions stopped growing. The area of inclusions increased first with the increase of temperature. When the temperature was 1 300 ℃, the area gradually decreased with the solution diffusion of sulfur and manganese, and finally the oxide inclusions remained. This further indicates that MnS inclusions precipitate after solidification.