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Hastelloy C-276合金熱變形動(dòng)態(tài)再結(jié)晶模型研究
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北京有色金屬研究總院,北京有色金屬研究總院

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TG146.1

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國(guó)家自然科學(xué)基金項(xiàng)目（面上項(xiàng)目，重點(diǎn)項(xiàng)目，重大項(xiàng)目）


Research on Dynamic Recrystallization Behavior of Hastelloy C-276 Alloy during Hot Deformation
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General Research Institute for Nonferrous Metals,General Research Institute for Nonferrous Metals

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    摘要:

    采用Gleeble-3500熱模擬試驗(yàn)機(jī)研究了Hastelloy C-276鎳基合金在不同變形條件下的熱壓縮流變應(yīng)力曲線，熱變形過(guò)程中發(fā)生了動(dòng)態(tài)再結(jié)晶行為。利用加工硬化率-應(yīng)力關(guān)系曲線確定了動(dòng)態(tài)再結(jié)晶臨界條件，采用Johnson-Mehl-Avrami(JMA)方程計(jì)算再結(jié)晶體積分?jǐn)?shù)實(shí)驗(yàn)值，建立了C-276合金動(dòng)態(tài)再結(jié)晶體積分?jǐn)?shù)和晶粒尺寸預(yù)測(cè)模型。結(jié)果表明：C-276合金動(dòng)態(tài)再結(jié)晶體積分?jǐn)?shù)隨著應(yīng)變量的增加，呈現(xiàn)典型的“S型”曲線；獲得臨界應(yīng)變條件表達(dá)式： ；動(dòng)態(tài)再結(jié)晶體積分?jǐn)?shù)表達(dá)式 ，預(yù)測(cè)值和實(shí)驗(yàn)值的平均誤差為2.16 %；晶粒長(zhǎng)大表達(dá)式 ，預(yù)測(cè)值和實(shí)驗(yàn)值的平均誤差為6.63 %。

    Abstract:

    The flow stress curve of Nickel base Alloy Hastelloy C-276 during hot deformation was investigated by compression test under varying temperature and strain rates up to a true strain of 0.7 on Gleeble 3500 simulator. Dynamic recrystallization(DRX) occurred during hot deformation. The recrystallization critical conditions were determined by relationships between work hardening rate and stress curve. Adopt Johnson-Mehl-Avrami(JMA) equation to calculate recrystallization volume fraction experimental value, established the dynamic recrystallization volume fraction model and grain growth forecast model of Hastelloy C-276 alloy. The results show that the increasement of recrystallization volume fraction presents the typical "S" type curve with the increase of strain. The equation of critical strain conditions was established ．The equation of recrystallization volume fraction is ，and the average error of the predicted values and experimental values was 2.16%. The grain growth equation is , the average error was 6.63%.

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杜彬,李德富. Hastelloy C-276合金熱變形動(dòng)態(tài)再結(jié)晶模型研究[J].稀有金屬材料與工程,2016,45(2):381~386.[dubin, Li Defu. Research on Dynamic Recrystallization Behavior of Hastelloy C-276 Alloy during Hot Deformation[J]. Rare Metal Materials and Engineering,2016,45(2):381~386.]
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  • 收稿日期:2014-03-23
  • 最后修改日期:2014-05-14
  • 錄用日期:2014-09-28
  • 在線發(fā)布日期: 2016-07-19
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