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一種含Re單晶鎳基合金的組織結(jié)構(gòu)與蠕變性能
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國家自然科學(xué)基金資助項目 (50571070)；教育部博士點基金資助項目 (20092102110003)


Microstructure and Creep Properties of a Single Crystal Nickel-based Superalloy Containing Re
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    摘要:

    通過組織形貌觀察及蠕變曲線測定，研究了一種含Re鎳基單晶合金在高溫的蠕變行為。結(jié)果表明，合金經(jīng)完全熱處理后的組織結(jié)構(gòu)是立方γ￠相以共格方式嵌鑲在γ基體中。在試驗的溫度和應(yīng)力范圍內(nèi)，與無Re合金相比較，含Re合金有較好的蠕變抗力及較長的蠕變壽命，并測算出合金在穩(wěn)態(tài)期間的蠕變激活能與應(yīng)力指數(shù)。通過分析位錯攀移越過筏狀γ￠相及影響合金應(yīng)變速率的因素，研究了合金在穩(wěn)態(tài)蠕變期間的變形機制，其中，元素Re溶入γ基體后可有效阻礙位錯運動，降低合金的應(yīng)變速率，是使合金具有較低應(yīng)變速率和較長蠕變壽命的主要原因

    Abstract:

    By means of measurement of creep properties and microstructure observation, the creep behaviors of a single crystal nickel-based superalloy containing 4.2%Re were investigated. Results show that after fully heat treated, the microstructure of the alloy consists of the cubical γ￠ phase embedded in the γ matrix as coherent form. In the range of the applied stresses and test temperatures, compared to the free-Re superalloy, the superalloy with 4.2% Re possesses a better creep resistance and longer creep lifetime, and the creep activation energy and stress exponent of the alloy during steady state creep have been calculated. By means of analyzing the dislocation climbing over the rafted γ￠ phase and the factors effecting on strain rates of the alloy, the deformation mechanism of the alloy during steady state creep was investigated. Thereinto, dissolving of Re into the alloy matrix may hinder the dislocations movement and reduce the strain rate of the alloy, which is thought to be the main reason for the alloy possessing lower strain rate and longer creep lifetime.

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田素貴,梁福順,黎阿男,李晶晶,王曉亮,張 特.一種含Re單晶鎳基合金的組織結(jié)構(gòu)與蠕變性能[J].稀有金屬材料與工程,2012,41(6):1016~1020.[Tian Sugui, Liang Fushun, Li Anan, Li Jingjing, Wang Xiaoliang, Zhang Te. Microstructure and Creep Properties of a Single Crystal Nickel-based Superalloy Containing Re[J]. Rare Metal Materials and Engineering,2012,41(6):1016~1020.]
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  • 收稿日期:2011-06-16
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