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GH761合金的熱變形行為與動態(tài)再結(jié)晶模型
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Flow Behavior and Dynamic Recrystallization Model for GH761 Superalloy during Hot Deformation
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    摘要:

    采用Gleeble-3500熱模擬試驗機研究GH761合金在變形溫度為900~1150 ℃，應(yīng)變速率為0.1~30 s-1條件下的熱變形行為，建立了GH761合金在熱態(tài)變形過程中的本構(gòu)方程。采用Quantiment-500型自動圖像分析儀定量測定試樣中的動態(tài)再結(jié)晶晶粒尺寸和再結(jié)晶體積分數(shù)。根據(jù)實驗結(jié)果，建立了GH761合金動態(tài)再結(jié)晶過程的物理模型，為科學設(shè)計和有效控制GH761合金的鍛造工藝提供理論依據(jù)

    Abstract:

    The deformation behavior and evolution process of dynamic recrystallization for GH761 superalloy were studied with isothermal compression test in the temperature range of 950 ℃~1150 ℃ and the strain rate range of 0.1 s-1~30 s-1. The effect of thermodynamic parameters on flow stress was analyzed. A constitutive relationship was proposed based on the Arrhenius equation for the GH761 superalloy. The initiation and evolution of dynamic recrystallization were investigated with quantitive microstructure analysis. The volume fracture and grain size of dynamic recrystallization were established as functions of the Zener-Hollomon parameter. It is found that the calculation results of the proposed model are well agreed with the experimental data. Therefore, the proposed model can lay foundation of the quality control and process design for the forging process of GH761 superalloy

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劉鵬飛,劉 東,羅子健,孫文儒,郭守仁,胡壯麒. GH761合金的熱變形行為與動態(tài)再結(jié)晶模型[J].稀有金屬材料與工程,2009,38(2):275~280.[Liu Pengfei, Liu Dong, Luo Zijian, Sun Wenru, Guo Shouren, Hu Zhuangqi. Flow Behavior and Dynamic Recrystallization Model for GH761 Superalloy during Hot Deformation[J]. Rare Metal Materials and Engineering,2009,38(2):275~280.]
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  • 收稿日期:2008-01-27
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