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利用光学显微镜、扫描电镜和能谱分析对采用真空感应熔炼和保护气氛电渣重熔双联工艺生产的617B合金电渣锭进行组织分析、析出相和元素偏析情况研究.依据残余偏析指数模型通过Dictra热力学软件计算提出七种不同的均匀化制度,并结合均匀化后的组织分析和热模拟压缩试验,确定了617B合金的最终均匀化制度.结果表明:经双联工艺生产的617B合金电渣锭中存在枝晶和元素偏析,其中Mo和Ti是主要的偏析元素;电渣锭组织的晶内存在较多的块状碳化物,表现为多种碳化物共生生长.经过1210℃保温48h均匀化处理后,枝晶和元素偏析基本消除,晶内的块状碳化物部分溶解,且均匀化后的合金表现出良好的塑性.
The microstructure, phase segregation and element segregation of 617B alloy electroslag was analyzed by optical microscope, scanning electron microscopy (SEM) and energy dispersive spectroscopy (ESR) .According to the model of residual segregation index Dictra thermodynamics software proposed seven different homogenization systems, combined with the homogenization of the tissue analysis and thermal simulation of compression test to determine the final homogenization of 617B alloy system.The results show that: the double-phase process of 617B alloy electroslag There are dendrites and elemental segregation in the ingot, in which Mo and Ti are the main segregation elements. There are many massive carbides in the ingot structure of the ingot, which shows the symbiotic growth of various carbides. After 1210 ℃ heat preservation for 48h, The dendrite and elemental segregation are basically eliminated after the treatment, and the massive carbides in the crystal are partially dissolved, and the homogenized alloy exhibits good ductility.