<strong>Ti-6Al-4V</strong>合金热压缩过程中的动态再结晶

doi:10.11901/1005.3093.2020.569

材料研究学报

2021, Vol. 35

Issue (8): 583-590 DOI: 10.11901/1005.3093.2020.569

研究论文

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Ti-6Al-4V合金热压缩过程中的动态再结晶

刘超¹, 王鑫¹, 门月¹, 张浩宇¹, 张思倩¹, 周舸¹(

), 陈立佳¹, 刘海建²

^1.沈阳工业大学材料科学与工程学院沈阳 110870
^2.上海航天精密机械研究所上海 201600

Dynamic Recrystallization of Ti-6Al-4V Alloy During Hot Compression

LIU Chao¹, WANG Xin¹, MEN Yue¹, ZHANG Haoyu¹, ZHANG Siqian¹, ZHOU Ge¹(

), CHEN Lijia¹, LIU Haijian²

^1.School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
^2.Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600, China

引用本文:

刘超, 王鑫, 门月, 张浩宇, 张思倩, 周舸, 陈立佳, 刘海建. Ti-6Al-4V合金热压缩过程中的动态再结晶[J]. 材料研究学报, 2021, 35(8): 583-590.
Chao LIU, Xin WANG, Yue MEN, Haoyu ZHANG, Siqian ZHANG, Ge ZHOU, Lijia CHEN, Haijian LIU. Dynamic Recrystallization of Ti-6Al-4V Alloy During Hot Compression[J]. Chinese Journal of Materials Research, 2021, 35(8): 583-590.

全文: PDF(12830 KB) HTML

摘要:

在变形温度为870~960℃、应变速率为5×10^-4 s^-1~5×10^-2 s^-1的条件下对Ti-6Al-4V合金进行单道次等温压缩实验，测出其应力-应变曲线并建立KM模型、Poliak-Jonas模型和Avrami模型，较为系统地描述了这种合金动态再结晶过程中的流变应力、临界应变量、组织演变动力学等的特征。将动态再结晶组织的转变体积分数引入Prasad功率耗散率模型，得到了Ti-6Al-4V合金动态再结晶过程中能量的变化规律并结合微观组织表征揭示了这种合金的动态再结晶机理。结果表明：随着变形温度的提高和应变速率的降低，Ti-6Al-4V合金的动态再结晶临界应变量减小，组织转变的体积分数增大。发生完全动态再结晶时的功率耗散率大于0.34，形核机制为位错诱导的弓出形核机制。

关键词 ：金属材料, Ti-6Al-4V合金, 动态再结晶, 物理模型, 热压缩变形, 微观组织

Abstract：

The stress-strain curves of Ti-6Al-4V alloy during hot deformation by applied strain rate within the range of 5×10^-4~5×10^-2 s^-1 at 870~960°C were measured via single-pass isothermal compression test. The dynamics characteristics of rheological stress, critical strain capacity and structure evolution of the alloy during dynamic recrystallization were systematically illustrated by means of KM model, Poliak-Jonas model, and Avrami model. Then a concept of volume fraction of the microstructure transformation, i.e., the portion of the alloy that has been underwent microstructure transformation during dynamic recrystallization, was introduced into the so called prasad power dissipation rate model, thus the energy variation of the alloy during dynamic recrystallization was acquired. Further, taking both of the acquired energy variation and the observed microstructure evolution characteristics together into consideration, the dynamic recrystallization mechanism of Ti-6Al-4V alloy may be revealed. It follows that the critical strain capacity of Ti-6Al-4V during dynamic recrystallization decreased and the structural transformation volume fraction increased following the rise of deformation temperature or the decline of strain rate. The power dissipation rate upon complete dynamic recrystallization is larger than 0.34, and the forming mechanism is a dislocation-induced arcuation nucleation mechanism.

Key words： metallic materials Ti-6Al-4V dynamic recrystallization physical models hot compression deformation microstructure

收稿日期: 2020-12-28

ZTFLH:

TG146.23

基金资助:国家自然科学基金(51805335)

作者简介: 刘超，男，1994年生，硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.569 或 https://www.cjmr.org/CN/Y2021/V35/I8/583

图1 Ti-6Al-4V合金在不同温度变形的真应力-应变曲线

表1 Ti-6Al-4V合金本构关系模型的参数

图2 Ti-6Al-4V合金不同应变速率下-??(lnθ)/??ε与ε的关系

表2 Ti-6Al-4V合金动态再结晶临界应变值(εc)

图3 Ti-6Al-4V合金的动态再结晶临界应变量关系

图4 Ti-6Al-4V合金在不同条件下动态再结晶体积分数Xd的演化

图5 Ti-6Al-4V合金动态再结晶功率耗散率的分布

图6 Ti-6Al-4V合金的金相照片

图7 Ti-6Al-4V合金的TEM照片

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