方向偏離鑄件軸向的最大角度在抽拉速率由40 μm/s提高至110 μm/s的過程中不斷減小。在70 μm/s的抽拉速度下，LMC鑄件中部截面處的中心區(qū)域內晶粒的最大偏離角度要大于HRS鑄件的相應位置處的偏離角，但是晶粒的整體取向卻呈現(xiàn)較HRS鑄件更集中的趨勢。鑄件頂部截面處的枝晶組織比中部截面處要粗大，這種現(xiàn)象在HRS鑄件中更嚴重。γ′ 相尺寸在鑄件由葉身位置凝固至平臺位置的過程中不斷粗化。但當抽拉速率高于70 μm/s時，葉身位置和平臺位置之間γ′ 相尺寸之間的差異在LMC鑄件中更小"/>

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Effect of Directional Solidification Methods on the Cast Microstructure and Grain Orientation of Blade Shaped DZ125 Superalloy
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Effect of Directional Solidification Methods on the Cast Microstructure and Grain Orientation of Blade Shaped DZ125 Superalloy
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National Basic Research Program of China (2010CB631202 and 2011CB610406); the National Natural Science Foundation of China (50827102, 50931004 and 51171151) and the Research Fund of the State Key Laboratory of Solidification Processing (57-TZ-2011)

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    摘要:

    對應用液態(tài)金屬冷卻(LMC)和高速凝固(HRS)方法制備的葉片狀高溫合金鑄件的鑄態(tài)組織進行了研究，以比較2種定向凝固方法的優(yōu)缺點。分別對沿鑄件凝固方向不同截面位置處的晶粒取向、一次枝晶間距和γ′ 相尺寸進行了分析。結果表明，對于HRS鑄件的中部截面，枝晶的<001>方向偏離鑄件軸向的最大角度在抽拉速率由40 μm/s提高至110 μm/s的過程中不斷減小。在70 μm/s的抽拉速度下，LMC鑄件中部截面處的中心區(qū)域內晶粒的最大偏離角度要大于HRS鑄件的相應位置處的偏離角，但是晶粒的整體取向卻呈現(xiàn)較HRS鑄件更集中的趨勢。鑄件頂部截面處的枝晶組織比中部截面處要粗大，這種現(xiàn)象在HRS鑄件中更嚴重。γ′ 相尺寸在鑄件由葉身位置凝固至平臺位置的過程中不斷粗化。但當抽拉速率高于70 μm/s時，葉身位置和平臺位置之間γ′ 相尺寸之間的差異在LMC鑄件中更小

    Abstract:

    The cast structures of blade-shaped castings of DZ125 superalloy processed by liquid metal cooling (LMC) and high rate solidification (HRS) methods were studied to compare the benefits and drawbacks of these two methods. The morphologies and the growth direction of grains, primary dendrite arm spacing, γ′ size were analyzed at different cross-sections along growth directions. The results indicate that the maximum deviation angle of primary dendrites from the sample axial decreases as the withdrawal rate increases from 40 to 110 μm/s for the central zone of HRS castings. At the withdrawal rate of 70 μm/s, the grains in the central zone of LMC casting have larger deviated angles, but the overall orientations of grains become more converging. The dendrites at the top of the blade are coarser than those at the middle, especially for the HRS castings. The γ′ size becomes larger as castings solidify from the airfoil to the platform, but the difference of γ′ size between the platform and the airfoil is smaller for LMC castings when the withdrawal rate is higher than 70 μm/s.

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葛丙明,劉 林,趙新寶,黃太文,張 軍,傅恒志. Effect of Directional Solidification Methods on the Cast Microstructure and Grain Orientation of Blade Shaped DZ125 Superalloy[J].稀有金屬材料與工程,2013,42(11):2222-2227~.[Ge Bingming, Liu Lin, Zhao Xinbao, Huang Taiwen, Zhang Jun, Fu Hengzhi. Effect of Directional Solidification Methods on the Cast Microstructure and Grain Orientation of Blade Shaped DZ125 Superalloy[J]. Rare Metal Materials and Engineering,2013,42(11):2222-2227~.]
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  • 收稿日期:2012-11-11
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