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在研究GH4169G合金准120mm铸锭均匀化制度基础上,介绍了验证合金均匀化效果的三种方法。分析铸态组织后,将试样进行不同程度的均匀化处理。通过文献结合实验确定δ相验证制度为910℃×14 h,AC。合金偏析严重时,δ相呈长针状分布在枝晶间,枝晶轴未析出区比例较大;合金均匀化改善时,枝晶间δ相析出面积增大,聚集程度降低,且针状相的长度减少过渡到棒状。均匀化程度更高时,枝晶轴基本上都有δ相析出,析出相呈棒状与粒状分布,主要差别在于枝晶轴/枝晶间析出量多少及部分区域聚集析出。完全均匀化,δ相呈粒状在晶粒内均匀析出,晶界仍有针状δ相析出。
On the basis of studying the homogenization system of GH4169G quasi-120mm ingot, three methods to verify the homogenization effect of the alloy are introduced. After analyzing the as-cast structure, the specimens were homogenized to varying degrees. According to the experimental results, the δ-phase validation system is 910 ℃ × 14 h, AC. When the alloy segregation is serious, the δ phase grows long needle-shaped distribution in the dendrite, the larger the proportion of un-precipitated dendrite axis; when the alloy homogenization improves, the δ phase precipitation area increases, the degree of aggregation decreases, and the acicular The length of the phase decreases to a rod-like shape. When the degree of homogenization is higher, there are basically δ phase precipitates in the dendritic shaft, and the precipitates are rod-like and granular. The main difference lies in the amount of precipitation between dendrite axis / dendrite and the precipitation in some areas. Completely homogenized, δ phase was granular precipitation within the grain, the grain boundary is still precipitated δ-phase.