鑄態TB6鈦合金熱變形行為及本構關系
發布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-01-14
通過等溫恒應變速率壓縮實驗研究鑄態TB6鈦合金在溫度為800~1 100 ℃，應變速率為10?3~1 s?1條件下的熱變形行為。
鑄態TB6鈦合金熱變形行為及本構關系Hot deformation behavior and constitutive relationship of?as-cast TB6 alloy通過等溫恒應變速率壓縮實驗研究鑄態TB6鈦合金在溫度為800~1 100 ℃，應變速率為10?3~1 s?1條件下的熱變形行為。結果表明：應變速率對鑄態TB6合金流變應力的影響最顯著，其次是變形溫度，而應變的影響作用最小。在低溫高應變速率下，流變應力曲線呈連續軟化特征，而在高溫低應變速率下，流變應力曲線呈穩態流變特征。鑄態TB6合金的熱變形激活能為200 kJ/mol，接近純鈦β相的自擴散激活能，表明在實驗條件范圍內主要發生動態回復過程。在Arrhenius方程基礎上考慮了應變對流變應力曲線的影響，建立了能準確描述鑄態TB6鈦合金流變應力曲線的雙曲正弦本構關系。
The hot deformation behavior of as-cast TB6 alloy was investigated by isothermal constant strain rate compression test at temperatures of 800?1 100 ℃ and strain rates of 10?3?1 s?1. The results show that the flow stress of as-cast TB6 alloy is greatly affected by strain rate, followed by temperature and the effect of strain is the weakest. The flow stress curves display continuous softening characteristics at low temperatures and high strain rates, while display steady flow characteristics at high temperatures and low strain rates. The activation energy is determined to be 200 kJ/mol which is close to that of self-diffusion of β phase in pure titanium, and it shows that the dynamic recovery takes place dominantly during hot deformation. Considering the effect of strain, an improved hyperbolic sine constitutive relationship is established based on the Arrhenius equation that can accurately describe the flow stress of as-cast TB6 alloy.
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AILIAI has been a reliable partner and supplier of sophisticated and high-quality semi-finished products maed of alloys. In dialogue with our customers, we optimise our products to meet the specific application requirements. AILIAI develops the best alloy material solutions for current and future challenges.
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