-1-1s-1,變形量為70%時(shí)的熱變形行為,建立了Ti-6Al-2.5V-1.5Fe-0.15O合金考慮應(yīng)變量的Arrhenius本構(gòu)方程,基于動(dòng)態(tài)材料模型建立熱加工圖。研究結(jié)果表明：變形溫度升高,應(yīng)變速率降低,流變應(yīng)力降低。通過(guò)本構(gòu)方程計(jì)算可得兩相區(qū)平均熱激活能為398.824KJ/mol,遠(yuǎn)大于純鈦?zhàn)约せ钅?表明熱變形軟化機(jī)制與動(dòng)態(tài)再結(jié)晶有關(guān)。單相區(qū)熱激活能為210.93KJ/mol,略大于純鈦?zhàn)约せ钅?以動(dòng)態(tài)回復(fù)為主。通過(guò)熱加工圖確定兩個(gè)失穩(wěn)區(qū),中等變形溫度(950℃-1070℃)高應(yīng)變速率(0.31-0.1s-1)易發(fā)生絕熱剪切,結(jié)合熱加工圖確定適合的加工區(qū)間：應(yīng)變速率為0.001-0.01s-1,變形溫度為875℃-925℃。"/>

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低成本Ti-Al-V-Fe-O鈦合金熱變形行為及熱加工圖
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哈爾濱工業(yè)大學(xué) 金屬精密熱加工國(guó)家級(jí)重點(diǎn)實(shí)驗(yàn)室,哈爾濱工業(yè)大學(xué) 金屬精密熱加工國(guó)家級(jí)重點(diǎn)實(shí)驗(yàn)室,西安航天發(fā)動(dòng)機(jī)廠,哈爾濱工業(yè)大學(xué) 金屬精密熱加工國(guó)家級(jí)重點(diǎn)實(shí)驗(yàn)室,哈爾濱工業(yè)大學(xué) 金屬精密熱加工國(guó)家級(jí)重點(diǎn)實(shí)驗(yàn)室,云南省鈦材應(yīng)用產(chǎn)品工程技術(shù)研究中心,哈爾濱工業(yè)大學(xué) 金屬精密熱加工國(guó)家級(jí)重點(diǎn)實(shí)驗(yàn)室,哈爾濱工業(yè)大學(xué) 金屬精密熱加工國(guó)家級(jí)重點(diǎn)實(shí)驗(yàn)室

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云南省省院省?？萍己献鲗ｍ?xiàng)項(xiàng)目(2013IB006) 國(guó)家自然科學(xué)基金資助(項(xiàng)目號(hào)51425402,51331005)


Hot deformation and processing maps of Ti-Al-V-Fe-O alloy
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    摘要:

    通過(guò)真空非自耗熔煉爐制備了低成本Ti-6Al-2.5V-1.5Fe-0.15O合金,利用Gleeble-1500D熱模擬機(jī),研究了其熱加工參數(shù)為：變形溫度875℃-1100℃、應(yīng)變速率0.001s-1-1s-1,變形量為70%時(shí)的熱變形行為,建立了Ti-6Al-2.5V-1.5Fe-0.15O合金考慮應(yīng)變量的Arrhenius本構(gòu)方程,基于動(dòng)態(tài)材料模型建立熱加工圖。研究結(jié)果表明：變形溫度升高,應(yīng)變速率降低,流變應(yīng)力降低。通過(guò)本構(gòu)方程計(jì)算可得兩相區(qū)平均熱激活能為398.824KJ/mol,遠(yuǎn)大于純鈦?zhàn)约せ钅?表明熱變形軟化機(jī)制與動(dòng)態(tài)再結(jié)晶有關(guān)。單相區(qū)熱激活能為210.93KJ/mol,略大于純鈦?zhàn)约せ钅?以動(dòng)態(tài)回復(fù)為主。通過(guò)熱加工圖確定兩個(gè)失穩(wěn)區(qū),中等變形溫度(950℃-1070℃)高應(yīng)變速率(0.31-0.1s-1)易發(fā)生絕熱剪切,結(jié)合熱加工圖確定適合的加工區(qū)間：應(yīng)變速率為0.001-0.01s-1,變形溫度為875℃-925℃。

    Abstract:

    The paper prepared the cast Ti-6Al-2.5V-1.5Fe-0.15O titanium alloys by the consumable vacuum arc furnace. Thermal simulation experiments are carried out by Gleebee 1500D, and different deformation temperatures (875℃-1100℃),train rates(0.001-1 s-1)and the same deformation degree(60%) were chose. Then phase equations of two phase and single based on Arrhenius model were built, considering the influence of strain. The processing map was built by DMM and Prasad instability criterion. The results show that the alloy is belonging to negative temperature and normal strain sensitivity material. The average thermal activation energy of two phase is 398.824KJ/mol,which is bigger than the pure titanium. The softening is related to the dynamic recrystallization softening mechanism. The average thermal activation energy of single phase is 210.93KJ/mol,slightly more than the pure titanium,The softening is related to the dynamic recovery. The two flow instability zones appear on the processing map,The adiabatic shearing easily happens at medium temperate from 950℃-1070℃ and the high strain rates from 0.31s-1 to 1s-1,The suitable zone for processing is in the strain rates from 0.001s-1to 0.1-1 and temperate from 875℃ to 925 ℃.

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駱良順,王富鑫,吳曉明,王亮,蘇彥慶,史亞鳴,郭景杰,傅恒志.低成本Ti-Al-V-Fe-O鈦合金熱變形行為及熱加工圖[J].稀有金屬材料與工程,2018,47(7):2049~2055.[Luo Liangshun, Wang Fuxin, Wu Xiaoming, Wang Liang, Su Yanqing, Shi Yaming, Guo Jingjie, Fu Hengzhi. Hot deformation and processing maps of Ti-Al-V-Fe-O alloy[J]. Rare Metal Materials and Engineering,2018,47(7):2049~2055.]
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  • 收稿日期:2016-07-11
  • 最后修改日期:2016-08-25
  • 錄用日期:2016-10-18
  • 在線發(fā)布日期: 2018-10-10
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