论文部分内容阅读
采用熔体超温处理技术对新型含Re和Ru的镍基单晶高温合金熔体进行不同温度的超温处理,利用EPMA研究了定向凝固过程中合金元素的溶质分布状态及溶质分配系数随熔体超温处理温度变化的演化规律.结果表明,在平界面定向凝固条件下,随熔体超温处理温度的升高,Al,Ta元素在固液界面前沿液相一侧的分布呈现先增大后减小的趋势,而Re,W,Ru,Co元素则呈现与之相反的规律,Mo,Cr元素无明显变化;而熔体超温处理温度对Ru,Co,Mo,Cr元素的溶质分配系数影响较小.熔体超温处理使合金熔体结构发生变化,进而影响元素分布,是导致溶质分配系数发生变化的主要原因.
The melt treatment of a new type of nickel-base single crystal superalloy containing Re and Ru was carried out by using the melt over-temperature treatment. The solute distribution and the solute partition coefficient of alloying elements during directional solidification were studied by EPMA. The results show that the distribution of Al and Ta at the liquidus front increases with the increase of the temperature of over-temperature melt under the condition of flat interface directional solidification. While the elements of Re, W, Ru, and Co show the opposite laws. The Mo and Cr elements have no obvious changes. However, the solute of Ru, Co, Mo and Cr The influence of the distribution coefficient is small.The melt temperature change causes the melt structure of the alloy to change, which in turn affects the elemental distribution, which is the main reason that the solute partition coefficient changes.