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半连续铸造的铝合金铸锭及其制品,在热加工和热处理时,往往表面出现隆起的表面起泡。研究证明,表面起泡主要是由氢引起的,氢有两个来源,分别导致两类表面起泡。结晶时进入铸锭的氢为内部氢。这部分氢引起的起泡称内部氢致表面起泡;加工和热处理环境中的氢渗入固体铝中称为环境氢,由此而引起的起泡为环境氢致表面起泡。此外,铸锭热加工时,空气、水汽和油污等裹入制品皮下也形成表面起泡,这种起泡既不是内部
Semi-continuous casting of aluminum alloy ingot and its products, in the thermal processing and heat treatment, the surface is often uplift surface bubbling. Studies have shown that surface foaming is mainly caused by hydrogen, with two sources of hydrogen, respectively, resulting in two types of surface foaming. Hydrogen entering the ingot during crystallization is internal hydrogen. This part of the hydrogen-induced blistering is called internal hydrogen-induced surface blistering. Hydrogen in the processing and heat treatment environments infiltrating into solid aluminum is called ambient hydrogen and the resulting blistering is ambient hydrogen-induced surface blistering. In addition, the hot ingot ingot, air, water vapor and oil into the skin and other products also formed a surface foaming, the foaming neither internal