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本文提出用钛白粉和冰晶石粉对铝液孕育处理,凝固后,可获得均匀细小的等轴晶组织。而且,这种铝液的凝固组织同浇注温度、冷却速度、凝固期间铝液的运动等铸造工艺因素的关系不大。同时,根据对铝液进行水平隔离,垂直隔离和水平垂直隔离的凝固实验提出,孕育铝液所以获得均匀的细等轴晶组织,主要是由于铝液中具有大量稳定的TiAl_3固态微粒,正是它们作为非自发核心,对凝固组织起着决定性作用。在这种情况下,从型壁和被冷却的液面上脱落的晶粒,对等轴晶的形成,影响是很小的。孕育处理时,对铝液的上下搅拌是促使TiAl_3成为固态微粒的重要条件。
In this paper, titanium dioxide and cryolite powder on the aluminum liquid inoculation treatment, after solidification, uniform and small equiaxial grain structure can be obtained. Moreover, the solidification microstructure of this molten aluminum casting temperature, cooling rate, the movement of liquid aluminum and other casting process has little to do with the casting process. In the meantime, according to the experiments of horizontal separation, vertical separation and horizontal and vertical isolation of molten aluminum, it is proposed that the uniform fine equiaxial grain structure can be obtained by inoculating molten aluminum, which is mainly due to the large amount of stable TiAl_3 solid particles in molten aluminum They act as non-spontaneous nuclei and play a decisive role in the solidification of tissues. In this case, the grains that fall off from the mold wall and the liquid surface to be cooled have little effect on the formation of equiaxed grains. Inoculation treatment, the liquid aluminum up and down stirring is to promote TiAl_3 become solid particles of the important conditions.