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Effects of Re and Ru Additions on Solidification Partition Coefficients and Solidification Characteristic Temperatures of Nickel Base Single Crystal Superalloys
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Effects of Re and Ru Additions on Solidification Partition Coefficients and Solidification Characteristic Temperatures of Nickel Base Single Crystal Superalloys
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National Natural Science Foundations of China (50931004); National Basic Research Program of China (2010CB631202)

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    摘要:

    采用雙區(qū)加熱和液態(tài)金屬冷卻相結(jié)合的定向凝固方法，制備出4種Re和Ru含量不同的平界面態(tài)鎳基單晶高溫合金，精確測定了近平衡凝固時合金中各元素的平衡分配系數(shù)和合金的凝固特征溫度。結(jié)果表明：Re的添加將顯著降低重偏析元素Re、W和Ta的偏析程度，使液相線溫度先降低后升高，而固相線溫度始終降低；Ru的添加對偏析的影響較小，并略微降低合金的液相線和固相線溫度。同時，根據(jù)平衡分配系數(shù)和凝固特征溫度可預(yù)測非平衡凝固態(tài)單晶合金的元素偏析和凝固缺陷形成傾向

    Abstract:

    In order to understand the effects of Re and Ru additions on solidification characteristics of nickel base single crystal superalloys, four nickel base single crystal superalloys containing different contents of Re and Ru, were produced by dual heating zone melting and liquid-metal cooling (LMC) directional solidification technique at the withdraw rate of 2 μm/s, and a planar solid/liquid interface was obtained. The equilibrium partition coefficients of each element and solidification characteristic temperatures of experimental alloys were also obtained. Results show that with the increasing of Re content, the segregation degree of high segregation elements Re, W and Ta decreases, the liquidus temperature decreases initially and then increases, while the solidus temperature decreases continuously. The addition of Ru has little influence on the partition of other elements, and slightly lowers the liquidus temperature and solidus temperature of superalloys. In addition, we can effectively forecast the segregation degree of elements and solidification defects of non-equilibrium directional solidified superalloys on the basis of equilibrium partition coefficients and solidification characteristic temperatures

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艾 誠,劉 剛,劉 林,宮聲凱,張 軍,傅恒志. Effects of Re and Ru Additions on Solidification Partition Coefficients and Solidification Characteristic Temperatures of Nickel Base Single Crystal Superalloys[J].稀有金屬材料與工程,2012,41(8):1336~1340.[Ai Cheng, Liu Gang, Liu Lin, Gong Shengkai, Zhang Jun, Fu Hengzhi. Effects of Re and Ru Additions on Solidification Partition Coefficients and Solidification Characteristic Temperatures of Nickel Base Single Crystal Superalloys[J]. Rare Metal Materials and Engineering,2012,41(8):1336~1340.]
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  • 收稿日期:2011-08-25
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