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石油管用Ti-6Al-4V-0.1Ru钛合金高温流变行为及预测模型研究
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1.中国石油集团石油管工程技术研究院;2.有研科技集团有限公司

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国家科技重大专项(2016ZX05020-002);陕西省创新能力支撑计划(2018KJXX-046)


An Investigation of High Temperature Behavior and Constitutive Model of Ti-6Al-4V-0.1Ru Titanium Alloy Used for Oil Country Tubular Goods
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The National Natural Science Foundation of China (2016ZX05020-002);the Shaanxi Innovation Capability Support Program(2018KJXX-046)

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    摘要:

    通过使用Gleeble-3500热模拟试验机进行等温单轴压缩试验,研究了Ti-6Al-4V-0.1Ru钛合金在温度800℃ 到 1100℃,应变速率0.01 s-1 到 10 s-1条件下的高温流变行为。结果表明,Ti-6Al-4V-0.1Ru钛合金的峰值应力随着变形温度的降低以及变形速率的增大而增大,软化机制在950℃以下为动态回复,在950℃以上为动态再结晶。通过使用线性回归的方法建立了Ti-6Al-4V-0.1Ru钛合金的Arrhenius本构模型,计算得到该合金的热激活能为720.477 kJ/mol,应变速率敏感指数为4.809。通过引入应变对材料常数α、n、A 和Q 的影响,建立了考虑应变的流变应力预测模型,通过对试验值和预测值的比对,相关系数达到96.9%,说明该模型具有较好的预测精度。

    Abstract:

    The hot deformation behavior of Ti-6Al-4V-0.1Ru titanium alloy was investigated by isothermal compression on Gleeble-3500 thermal simulator under the conditions of deformation temperature ranging from 800℃ to 1100℃ and strain rate ranging from 0.01 s-1 to 10 s-1. The results revealed that the peak stress of Ti-6Al-4V-0.1Ru titanium alloy increased with decreasing the deformation temperature and increasing the strain rate, the softening mechanism was dynamic recovery below 950℃ and dynamic recrystallization above 950℃. The constitutive equation of Ti-6Al-4V-0.1Ru alloy was calculated by a linear regression analysis in two phase regions in the form of Arrhenius-type relationships. It is found that the apparent activation energies were calculated to be 720.477 kJ/mol and strain rate sensitivity index was 4.809. By introducing the influence of strain on the material constants of α, n, A and Q, the fixed constitutive model of flow stress was established, through comparing the experimental and predicted results, the correlation coefficient reached 96.9%, it was illustrated that this constitutive model had better prediction precision.

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刘强,白强,田峰,于洋,惠松晓,宋生印.石油管用Ti-6Al-4V-0.1Ru钛合金高温流变行为及预测模型研究[J].稀有金属材料与工程,2020,49(1):177~184.[刘强,baiqiang, tianfeng, yuyang, huisongxiao, songshenying. An Investigation of High Temperature Behavior and Constitutive Model of Ti-6Al-4V-0.1Ru Titanium Alloy Used for Oil Country Tubular Goods[J]. Rare Metal Materials and Engineering,2020,49(1):177~184.]
DOI:10.12442/j. issn.1002-185X.20181182

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  • 收稿日期:2018-11-25
  • 最后修改日期:2019-01-29
  • 录用日期:2019-02-22
  • 在线发布日期: 2020-02-16
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