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TC4鈦合金熱變形行為研究及本構(gòu)模型
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南昌大學(xué)機(jī)電學(xué)院,南昌大學(xué)機(jī)電學(xué)院,南昌大學(xué)機(jī)電學(xué)院,南昌大學(xué)機(jī)電學(xué)院

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TG? ? ?

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國家自然科學(xué)基金資助(項(xiàng)目號(hào)51164030),航空科學(xué)基金資助(項(xiàng)目號(hào)2014ZE56015)


Constitutive equation for hot deformation behavior of TC4 titanium alloy
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School of Mechatronics Engineering,Nanchang University,School of Mechatronics Engineering,Nanchang University,School of Mechatronics Engineering,Nanchang University,School of Mechatronics Engineering,Nanchang University

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    摘要:

    利用Gleeble-3500熱模擬試驗(yàn)機(jī)進(jìn)行等溫恒應(yīng)變速率熱壓縮實(shí)驗(yàn)，研究了TC4鈦合金在溫度800~950℃、應(yīng)變速率0.001~10s-1條件下的流動(dòng)軟化行為。研究發(fā)現(xiàn)隨變形溫度降低和應(yīng)變速率增大TC4鈦合金的流動(dòng)軟化程度增大，且800~850℃、應(yīng)變速率1~10s-1變形時(shí)的流動(dòng)軟化主要是塑形流動(dòng)失穩(wěn)引起的，溫度900~950℃、應(yīng)變速率0.001~0.1s-1條件變形時(shí)，流動(dòng)軟化主要是片狀α相的等軸化引起的。引入應(yīng)變對(duì)材料常數(shù)α、n、A和Q的影響，建立了考慮應(yīng)變的TC4鈦合金Arrhenius本構(gòu)方程，建立的本構(gòu)模型精度較好，在800℃、850℃和10s-1條件以及在900℃、950℃和0.1s-1條件下，模型平均絕對(duì)誤差分別為4.2%和4.3%。TC4鈦合金的平均變形激活能為403kJ/mol，平均應(yīng)變速率敏感指數(shù)為0.26。

    Abstract:

    Abstract: Hot compression tests were conducted on TC4 titanium alloy at different temperatures in a range of 800-950℃ and at different strain rates in the range of 0.001-10s-1. Flow softening behavior of this alloy was investigated. The flow softening degree increased with increasing strain rate and decreasing temperature. Meanwhile, softening was mainly attributed to flow instability at temperatures of 800℃and 850℃, strain rates of 1 s?1 and 10 s?1. Conversly, softening was dominated by globularization of lamellar alpha at temperatures of 900℃and 950℃, strain rates of 0.001 s?1 , 0.01 s?1 and 0.1 s?1. In addition, the effect of strain was incorporated in the Arrhenius equation by considering the effects of strain on material constants including α、n、A and Q. The calculated flow stresses were compared with the experimental results. Results show that this model gives a precise estimate for the flow stress, especially at 800-850℃and 10s-1, 900-950℃ and 0.1s-1. The average deformation activation energy is about 403kJ/mol and the average strain rate sensitivity exponent of TC4 alloy is 0.26.

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徐 勇,楊湘杰,何 毅,杜丹妮. TC4鈦合金熱變形行為研究及本構(gòu)模型[J].稀有金屬材料與工程,2017,46(5):1320~1326.[Xu Yong, Yang Xiangjie, He Yi, Du Danni. Constitutive equation for hot deformation behavior of TC4 titanium alloy[J]. Rare Metal Materials and Engineering,2017,46(5):1320~1326.]
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  • 收稿日期:2015-03-03
  • 最后修改日期:2015-11-09
  • 錄用日期:2015-11-18
  • 在線發(fā)布日期: 2017-09-27
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