GH4169G合金均匀化过程δ相的析出变化
Variation of δ Phase Precipitation During Homogenization for GH4169G Alloy
杨国良, 李晓桥
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作者单位：(沈阳大学 机械工程学院, 辽宁 沈阳 110044)
中文关键字：GH4169G合金； 均匀化； δ相变化
英文关键字：GH4169G alloy; homogenization; variation of δ phase
中文摘要：在研究GH4169G合金?准120 mm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。
英文摘要：Three methods were introduced to estimate the homogenization effects of GH4169G alloy ingot with ?准120 mm diameter on the base of the investigation of the homogenization system. The samples were heated in different extent of homogenization after analyzing the as-cast microstructure. The estimation method is found out through the distribution of δ phase in the matrix of the alloy, it is 910 ℃ × 14 h, air cooling. When the elemental segregation is serious, acicular δ phases are gathered densely in interdendric area and even in clusters at some grain boundaries. With the improvement of homogenization, δ phase distribution area is enlarged to dendrite part with fewer phases but precipitated more uniformly in dendritic crystal. And δ phase changes mainly from acicular to rod-like with some granular precipitating among them. When homogenization reaches satisfaction, granular δ phases are well-proportioned in the grain with some rod-like δ phase precipitated at grain boundary.