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工業(yè)純鈦TA2中低溫蠕變特征研究
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南京工業(yè)大學(xué)機(jī)械與能源動(dòng)力工程學(xué)院,南京工業(yè)大學(xué)機(jī)械與能源動(dòng)力工程學(xué)院,南京工業(yè)大學(xué)機(jī)械與能源動(dòng)力工程學(xué)院,南京工業(yè)大學(xué)機(jī)械與能源動(dòng)力工程學(xué)院,南京工業(yè)大學(xué)機(jī)械與能源動(dòng)力工程學(xué)院

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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）


Creep Behavior of CP-Ti TA2 at Low Temperature and Intermediate Temperature
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School of Mechanical and Power Engineering,Nanjing Tech University,School of Mechanical and Power Engineering,Nanjing Tech University,School of Mechanical and Power Engineering,Nanjing Tech University,School of Mechanical and Power Engineering,Nanjing Tech University,School of Mechanical and Power Engineering,Nanjing Tech University

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    摘要:

    工業(yè)純鈦TA2中低溫蠕變行為存在顯著的溫度及應(yīng)力相關(guān)性?；谕饧討?yīng)力水平和蠕變應(yīng)變的變化關(guān)系，確定不同蠕變溫度下的門檻應(yīng)力水平。根據(jù)短時(shí)蠕變實(shí)驗(yàn)數(shù)據(jù)，利用包含穩(wěn)態(tài)蠕變速率的本構(gòu)方程外推穩(wěn)態(tài)蠕變速率，而后進(jìn)行兩組相對(duì)長(zhǎng)時(shí)的蠕變實(shí)驗(yàn)，證明了工業(yè)純鈦中低溫蠕變是存在穩(wěn)態(tài)蠕變階段的。利用穩(wěn)態(tài)蠕變速率與應(yīng)力關(guān)系，計(jì)算出工業(yè)純鈦室溫蠕變應(yīng)力指數(shù)為6.96，也說(shuō)明了外推穩(wěn)態(tài)蠕變速率的可靠性。由中低溫蠕變激活能隨著蠕變進(jìn)行變化不大（≈60KJ/mol），且一直大于以位錯(cuò)為變形主導(dǎo)機(jī)制的變形激活能（30-40KJ/mol），表明孿晶對(duì)于工業(yè)純鈦中低溫蠕變發(fā)展整個(gè)階段均起重要作用。根據(jù)蠕變后試樣孿晶結(jié)構(gòu)隨溫度的變化解釋了TA2蠕變行為的溫度相關(guān)性，同時(shí)也證明了孿晶對(duì)于TA2蠕變行為的重要性.

    Abstract:

    Significant temperature and stress dependent creep behavior of commercial pure titanium TA2 was observed at low and intermediate temperature. According to the variation of creep strain with applied stress level, the relationship between threshold stress level and the corresponding creep temperature was determined. Based on short time creep tests, the constitutive equation containing steady state creep strain rate was used to extrapolate the minimum creep rate. The existence of steady state creep of commercial pure titanium TA2 was confirmed by subsequent long time creep experiments. Through the minimum creep strain rates, creep stress exponent was obtained which also indicates the accuracy of the extrapolated minimum creep strain rates. The activation energy of primary creep (approximately 60KJ/mol) at different creep strains level was higher than the activation energy for slip controlled creep, which demonstrates the importance of twinning for the development of creep behavior of commercial pure titanium TA2 at low temperature. Moreover, according to the variation of twinning structure with deformed temperature in creep tested specimens, the temperature dependent creep behavior was interpreted and the importance of twinning for creep behavior of TA2 was confirmed.

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常樂(lè),周昌玉,彭劍,李建,賀小華.工業(yè)純鈦TA2中低溫蠕變特征研究[J].稀有金屬材料與工程,2017,46(6):1463~1468.[Chang Le, Zhou Changyu, Peng Jian, Li Jian, He Xiaohua. Creep Behavior of CP-Ti TA2 at Low Temperature and Intermediate Temperature[J]. Rare Metal Materials and Engineering,2017,46(6):1463~1468.]
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  • 收稿日期:2015-03-31
  • 最后修改日期:2015-07-12
  • 錄用日期:2015-09-06
  • 在線發(fā)布日期: 2017-11-07
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