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700 ℃超超臨界鍋爐材料GH4700合金鑄態(tài)組織及 均勻化工藝
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國家自然科學基金(50831008)


Microstructure and Homogenization of As-cast GH4700 Alloy for 700 oC Ultra-supercritical Boilers
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    摘要:

    對經(jīng)過真空感應熔煉和保護氣氛電渣重熔的鎳基合金GH4700鑄錠進行研究，分析了其枝晶形貌、元素偏析和析出相特點，運用殘余偏析指數(shù)理論和擴散動力學軟件計算了均勻化動力學曲線并提出5種均勻化制度，通過對不同均勻化工藝結果的分析和熱壓縮模擬實驗驗證，確定了GH4700的均勻化制度。結果表明：GH4700合金電渣錠主要存在Nb、Ti元素偏析，電渣錠析出相為γ、γ′、Laves相和一次碳化物MC。經(jīng)過1170 ℃/48 h均勻化熱處理后，合金元素偏析基本消失、有害析出相Laves回溶且具有較好的熱加工塑性

    Abstract:

    Nickel-based superalloy GH4700 ingots of vacuum-induction-melting and electroslag-remelting were prepared and their dendrite morphology, segregation and precipitation were investigated. Kinetic homogenizing curves were calculated by Dictra software through a residual segregation parameter model. Based on the theoretical results, five homogenizing treatments were tested and validated by microstructural analysis and thermal compressions. The results show that Nb and Ti are the principal segregated elements of GH4700 ingots. The precipitated phases of casting ingots include γ, γ′, Laves and primary carbide. After homogenization at 1170 oC/48 h, the segregation of elements Nb and Ti are almost eliminated. The phase of Laves, which is detrimental to plasticity, dissolves to the matrix. GH4700 alloy exhibits excellent workability after homogenizing heat treatment

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王 玨,吳 赟,董建新,張麥倉,謝錫善,徐芳泓.700 ℃超超臨界鍋爐材料GH4700合金鑄態(tài)組織及 均勻化工藝[J].稀有金屬材料與工程,2013,42(9):1908~1914.[Wang Jue, Wu Yun, Dong Jianxin, Zhang Maicang, Xie Xishan, Xu Fanghong. Microstructure and Homogenization of As-cast GH4700 Alloy for 700 oC Ultra-supercritical Boilers[J]. Rare Metal Materials and Engineering,2013,42(9):1908~1914.]
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  • 收稿日期:2012-09-28
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