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利用光学显微镜、扫描显微镜及能谱仪,研究了经双联真空(VIM+VAR)冶炼生产的130mm自耗锭GH350合金铸态和不同均匀化过程中显微组织和元素偏析的规律。结果表明,铸态GH350合金中存在复杂的第二相组织和严重的枝晶偏析,Nb、Ti、Ta等溶质元素大量偏聚于枝晶间的Laves相等第二相中,而Cr、Mo等元素则偏聚于枝晶干。并且发现铸态GH350合金经1 180℃×40h炉冷后,枝晶偏析基本消除,合金成分基本均匀。
The microstructure and elemental segregation of 130mm selfsuperent GH350 alloy produced by twin vacuum vacuum (VIM + VAR) smelting were investigated by means of optical microscope, scanning microscope and energy dispersive spectrometer. The results show that there are complex second phase microstructure and severe dendritic segregation in the as-cast GH350 alloy. Solute elements such as Nb, Ti and Ta are segregated in the Laves phase second phase between the dendrites. Cr, Mo, etc. Element is segregated in dendrite stem. And found that as-cast GH350 alloy after 180 ℃ × 40h furnace cooling, dendrite segregation basically eliminated, the alloy composition is basically uniform.