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TA15鈦合金等溫近β變形行為及微觀組織演化
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國家重大基礎(chǔ)科研“973”課題 (2010CB731701); 國家自然科學(xué)基金重點項目 (50935007); 青年科學(xué)基金 (50905145); 凝固技術(shù)國家重點實驗室自主課題 (59-TP-2010); “111”引智計劃 (B08040)


Deformation Behavior and Microstructure Evolution of TA15 Titanium Alloy after Isothermal near β Deformation
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    摘要:

    通過熱模擬壓縮實驗研究了TA15鈦合金等溫近β變形行為和微觀組織演化，定量分析揭示了近β變形溫度、應(yīng)變速率、變形量對TA15合金流動應(yīng)力和微觀組織的影響。結(jié)果表明：在近β變形過程中，變形溫度升高，應(yīng)變速率降低，將抑制動態(tài)再結(jié)晶過程，促進(jìn)動態(tài)回復(fù)過程；變形溫度降低，應(yīng)變速率升高，將抑制動態(tài)回復(fù)過程，促進(jìn)動態(tài)再結(jié)晶過程。變形溫度是影響等軸α相含量，晶粒尺寸和平均軸比的主要因素，增加應(yīng)變速率對等軸α相晶粒細(xì)化的作用并不明顯。在近β溫度區(qū)間，建立了等軸α相含量和晶粒尺寸與變形溫度關(guān)系的經(jīng)驗?zāi)Ｐ汀Ｑ芯拷Y(jié)果可為TA15鈦合金等溫近β成形工藝優(yōu)化控制提供依據(jù)

    Abstract:

    The deformation behavior and microstructure evolution after isothermal near β deformation of TA15 titanium alloy with initially equiaxed microstructure were investigated by compression tests. The effects of deformation temperature, strain and strain rate on the deformation behavior and microstructure transformation were quantitatively characterized through metallographs analysis. Results show that dynamic recrystallization is suppressed and dynamic recovery is promoted with the deformation temperature increasing or the strain rate decreasing. Otherwise dynamic recrystallization is promoted and dynamic recovery is suppressed with the deformation temperature decreasing or the strain rate increasing. Deformation temperature is the primary factor influencing the volume fraction, the size and the aspect of equiaxed α. Increasing strain rate has little effect on the refinement of equiaxed α. The empirical model was developed to describe the relationship between deformation temperature and the volume fraction as well as the size of equiaxed α in the near β temperature range. The research results can provide a guide for process optimization and control of isothermal near β deformation of TA15 titanium alloy

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郜 陽,孫志超,楊 合. TA15鈦合金等溫近β變形行為及微觀組織演化[J].稀有金屬材料與工程,2013,42(5):951~956.[Gao Yang, Sun Zhichao, Yang He. Deformation Behavior and Microstructure Evolution of TA15 Titanium Alloy after Isothermal near β Deformation[J]. Rare Metal Materials and Engineering,2013,42(5):951~956.]
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  • 收稿日期:2012-04-15
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