论文部分内容阅读
直接水冷半连续铸造生产的铸锭,由于不平衡冷却和温度过冷、浓度过冷,合金凝固结晶时必然发生溶质元素的再分配,在铸锭显微组织上存在枝晶偏析,在晶界和枝晶间界上存在不平衡共晶,难熔元素在晶内过饱和。这种组织状态不仅降低铸锭的加工工艺塑性,降低合金的耐电化学腐蚀性能,同时也影响加工材的组织和力学性能。为了克服以上弊病,通常将铸锭进行组织均匀化处理。
Directly cooled semi-continuous casting of ingot production, due to the uneven cooling and the temperature is too cold, the concentration is too cold, the solidification of the alloy will inevitably occur re-distribution of solute elements in the ingot microstructure exists dendritic segregation in grain boundaries And dendrites exist on the interface between the unbalanced eutectic, refractory elements in the crystal supersaturated. This state of the organization not only reduces the plastic processing of the ingot casting process, reducing the electrochemical corrosion resistance of the alloy, but also affect the processing of the material and mechanical properties. In order to overcome the above defects, the ingot is usually homogenized.