Internal-variable analysis of high-temperature deformation behavior of Ti-6A1-4V: A comparative study of the strain-rate-jump and load-relaxation tests

Taekyung Lee; Jae Hyung Kim; S.L Semiatin; Chong Soo Lee

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Internal-variable analysis of high-temperature deformation behavior of Ti-6A1-4V: A comparative study of the strain-rate-jump and load-relaxation tests

机译：Ti-6A1-4V高温变形行为的内部变量分析：应变率跳跃和载荷松弛试验的比较研究

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The high-temperature deformation mechanisms of Ti-6A1-4V with either a fine or coarse alpha particle size were quantified using an internal-variable theory. For this purpose, strain rate jump tests (SRJT) and load relaxation tests (LRT) were conducted at 700, 800, and 900 ℃ to determine the strain rate sensitivity and to establish constitutive behavior. Stress-strain rate plots obtained by both SRJT and LRT were in good agreement with the theoretical predictions based on the activation of grain-matrix deformation and particle/grain-boundary sliding (P/GBS). The relative contribution of the two mechanisms varied with the microstructure, temperature, and strain rate, which affected the flow stress and strain rate sensitivity of the alloys. A clear difference in the strain rate sensitivity was observed depending on the experimental method. In all cases, the SRJT values were higher than those from the LRT. The discrepancy in strain rate sensitivity could be attributed to a variation in prestrain between the two methods. This variation resulted in microstructural differences, such as the fraction of alpha/beta interfaces and the misorientation of alpha grain boundaries, and hence affected the contribution of P/GBS to the overall deformation.

机译：使用内部变量理论对Ti-6A1-4V的高温变形机理（具有细或粗的α粒度）进行了定量。为此，在700、800和900℃下进行了应变率跳跃测试（SRJT）和载荷松弛测试（LRT），以确定应变率敏感性并建立本构行为。通过SRJT和LRT获得的应力-应变率曲线与基于晶粒矩阵变形和颗粒/晶粒边界滑动（P / GBS）的激活的理论预测非常吻合。两种机理的相对贡献随组织，温度和应变速率的变化而变化，这影响了合金的流变应力和应变速率敏感性。观察到应变率灵敏度的明显差异取决于实验方法。在所有情况下，SRJT值均高于轻轨。应变率敏感性的差异可能归因于两种方法之间的预应变差异。这种变化导致微观结构的差异，例如α/β界面的比例和α晶界的取向错误，因此影响了P / GBS对整体变形的贡献。

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《Materials Science and Engineering》 |2013年第1期|180-189|共10页
作者
Taekyung Lee; Jae Hyung Kim; S.L Semiatin; Chong Soo Lee;
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作者单位

Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea;

Graduate Institute of Ferrous Technology (GIFT), Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea;

Air Force Research Laboratory, AFRL/RXCM, Wright-Patterson Air Force Base, OH 45433-7817, USA;

Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea,Graduate Institute of Ferrous Technology (GIFT), Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea;

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titanium alloys; superplasticity; mechanical characterization; high-temperature deformation; constitutive modeling; grain boundary sliding;

机译：钛合金超塑性机械特性高温变形本构模型晶界滑动;

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机译：高温变形机制的荷载 - 松弛研究

Internal-variable analysis of high-temperature deformation behavior of Ti-6A1-4V: A comparative study of the strain-rate-jump and load-relaxation tests

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