采用熔體超溫處理技術對新型含 Re和 Ru 的鎳基單晶高溫合金熔體進行不同溫度的超溫處理, 利用電子探針系統研究了定向凝固過程中合金元素的溶質分布狀態及溶質分配系數隨熔體超溫處理溫度變化的演化規律. 結果表明, 在平界面定向凝固條件下, 隨熔體超溫處理溫度的升高, Al, Ta元素在固液界面前沿液相一側的分布呈現先增大后減小的趨勢, 而 Re, W, Ru, Co 元素則呈現與之相反的規律, Mo, Cr 元素無明顯變化; 當熔體從1500 ℃過熱到 1700 ℃C 時, 各溶質元素的溶質分配系數趨近于 1; 當進一步提高熔體溫度至 1800 ℃時, 各元素溶質分配系數逐漸偏離 1; 而熔體超溫處理溫度對 Ru, Co, Mo, Cr 元素的溶質分配系數影響較小. 熔體超溫處理使合金熔體結構發生變化, 進而影響元素分布, 是導致溶質分配系數發生變化的主要原因.?
Solute partition coefficient plays an important role in determining the microstructure and?mechanical properties of Ni-based superalloys. Melt superheating treatment can greatly affect the melt structure?and redistribution of solute atom in the melt. However, up to date, there are few investigations of the influence of?melt superheating treatment on the solute partition coefficient, especially for the new-generation Ni-based single?crystal superalloy with additions of Re and Ru. Therefore, in this work, the influence of melt superheating?treatment temperature on the solute partition coefficient of a new Ni-based single crystal superalloy with Re and?Ru elements under planar solid/liquid (S/L) interface under directional solidification conditions was?systematically investigated by using EPMA. It was found that the distribution of solute elements, such as Al, Ta,?Ru, Re, W, Co, showed remarkable change in both sides?of the S/L interface with increasing melt superheating?treatment temperature, but there was little change for the?solute elements of Mo and Cr. With increasing the?superheating treatment temperature, the concentration of?solute elements for Al and Ta increased firstly and then?decreased, but it showed an opposite trend for Re, W, Ru?and Co. When the melt superheating treatment temperature increased from 1500 ℃ to 1700 ℃, the solute?partition coefficients of major solute elements were approaching to 1, however, when the melt superheating?temperature further increased, the solute partition coefficients of the major solute elements deviated from 1.?Additionally, the change of the solute partition coefficients for Ru, Co, Mo and Cr were small with increasing the?melt superheating treatment temperature. The main reasons related to the above changes can be ascribed to that?the variation of melt superheating treatment temperature affects the size of the atom clusters in melt, which gives?rise to the variation of atomic distribution, and thus leads to the change of solute partition coefficients.?
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