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利用定量分析手段建立INCONEL718高温合金的均匀化模型。采用金相法确定d406mm铸锭的初熔温度,结果表明其初熔温度为1170～1180°C。采用两阶段均匀化热处理消除枝晶显微偏析。为了定量预测 Laves相的溶解过程,提出一个和时间、温度相关的均匀化模型。在铸态组织的所有偏析元素中,Nb和Ti为偏析程度最大的正偏析元素。然后,分别计算在1140 °C时各合金元素的扩散系数,并与另外两种常见的含铌高温合金进行比较。
The homogenization model of INCONEL718 superalloy was established by quantitative analysis. Metallographic method was used to determine the initial melting temperature of d406mm ingot. The results showed that the initial melting temperature was 1170 ~ 1180 ° C. Degradation of dendrite by two stage homogenization heat treatment. In order to quantitatively predict the dissolution process of Laves phase, a time and temperature-dependent homogenization model was proposed. Of all segregation elements in the as-cast microstructure, Nb and Ti are the most segregated positive segregation elements. Then, the diffusion coefficient of each alloying element at 1140 ° C was calculated and compared with the other two common niobium-containing superalloys.