-1。建立了四種本構(gòu)模型,分別是應(yīng)變補償雙曲正弦模型、修正Arrhenius模型、Johnson Cook模型和修正Johnson Cook模型,用來表征鑄態(tài)TC17鈦合金的高溫流動應(yīng)力。采用相關(guān)系數(shù)、平均相對誤差和相對誤差統(tǒng)計分析了四種模型的準(zhǔn)確性,結(jié)果表明：Johnson Cook模型不能用來描述鑄態(tài)TC17鈦合金高溫流動應(yīng)力；在α+β兩相區(qū),應(yīng)變補償雙曲正弦模型精度最高,而在β單相區(qū)修正Johnson Cook模型更為準(zhǔn)確；在整個變形溫度范圍內(nèi),應(yīng)變補償雙曲正弦模型比其他幾種模型的準(zhǔn)確性更高。"/>

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鑄態(tài)TC17鈦合金流動應(yīng)力預(yù)測
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1.西安建筑科技大學(xué) 冶金工程學(xué)院;2.西安建筑科技大學(xué)

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基金項目:

NSFC (51574192, U1360105), Key Research and Development Program of Shaanxi (2017ZDXM-GY-036)


Flow Stress Prediction for as-cast TC17 Titanium Alloy
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NSFC (51574192, U1360105), Key Research and Development Program of Shaanxi (2017ZDXM-GY-036)

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    摘要:

    通過熱模擬壓縮試驗對鑄態(tài)TC17鈦合金的高溫變形行為進(jìn)行了研究。溫度范圍1073-1373K,應(yīng)變速率范圍0.01-20s-1。建立了四種本構(gòu)模型,分別是應(yīng)變補償雙曲正弦模型、修正Arrhenius模型、Johnson Cook模型和修正Johnson Cook模型,用來表征鑄態(tài)TC17鈦合金的高溫流動應(yīng)力。采用相關(guān)系數(shù)、平均相對誤差和相對誤差統(tǒng)計分析了四種模型的準(zhǔn)確性,結(jié)果表明：Johnson Cook模型不能用來描述鑄態(tài)TC17鈦合金高溫流動應(yīng)力；在α+β兩相區(qū),應(yīng)變補償雙曲正弦模型精度最高,而在β單相區(qū)修正Johnson Cook模型更為準(zhǔn)確；在整個變形溫度范圍內(nèi),應(yīng)變補償雙曲正弦模型比其他幾種模型的準(zhǔn)確性更高。

    Abstract:

    In this paper, hot deformation behavior of as-cast TC17 titanium alloy was investigated by isothermal hot compression tests at temperatures of 1073~1373K and strain rates of 0.01~20s-1. The four constitutive models, strain compensated Arrhenius-type (SCA), modified Arrhenius-type (MA), Johnson Cook (JC) and Modified Johnson Cook (MJC), were used to represent the elevated temperature flow behavior of as-cast TC17 titanium alloy. The suitability levels of these models were evaluated by comparing both the correlation coefficient R and the average absolute relative error (AARE). The results indicated that JC model the JC model is inadequate to predict the flow stress of as-cast TC17 titanium alloy; the SCA model has the highest accuracy to descript of flow behavior of TC17 alloy in the α+β two-phase region in the studied range. While the MJC model exhibits the highest accuracy in the β single-phase region. Within the whole deformation temperature range, the SCA model proposed in this paper can more accurately conform to the high-temperature rheological curve of as-cast TC17 titanium alloy.

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楊曉康,王快社,張志娟,郭敏,蔡軍,楊清相.鑄態(tài)TC17鈦合金流動應(yīng)力預(yù)測[J].稀有金屬材料與工程,2020,49(4):1131~1139.[Yang Xiaokang, Wang Kuaishe, Zhang Zhijuan, Guo Min, Cai Jun, Yang Qingxiang. Flow Stress Prediction for as-cast TC17 Titanium Alloy[J]. Rare Metal Materials and Engineering,2020,49(4):1131~1139.]
DOI：10.12442/j. issn.1002-185X.20200230

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  • 收稿日期:2020-04-07
  • 最后修改日期:2020-04-09
  • 錄用日期:2020-04-20
  • 在線發(fā)布日期: 2020-05-07
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