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在直接水冷半连续铸造条件下生产的变形铝合金铸锭,由于不平衡冷却引起温度过冷和浓度过冷,在晶内或枝晶内会发生溶质再分配和晶内难熔元素过饱和,并在晶界或枝晶界发生溶质元素富集.为了使晶界和枝晶界富集的溶质元素溶入晶粒内部,并在晶内和枝晶内均匀分布,同时使过饱和的难熔元素沉淀析出,通常要对铸锭进行均火处理.
In the direct water-cooled semi-continuous casting of deformed aluminum alloy ingot casting, as a result of uneven temperature cooling caused by overcooling and supercooling, intramolecular or dendrite solute redistribution and refractory element within the supersaturation, And enrichment of solute elements occurs at grain boundaries or dendrite boundaries.In order to dissolve the solute elements enriched in the grain boundaries and dendrite boundaries into the grains and uniformly distributed in the grains and dendrites and at the same time the supersaturated refractory elements Precipitation precipitation, usually for ingot are equalizing treatment.