电子束冷床熔炼<strong>TC4</strong>钛合金的热变形行为

doi:10.11901/1005.3093.2020.103

材料研究学报

2020, Vol. 34

Issue (9): 665-673 DOI: 10.11901/1005.3093.2020.103

研究论文

本期目录 | 过刊浏览

电子束冷床熔炼TC4钛合金的热变形行为

王伟¹^,²(

), 宫鹏辉¹, 张浩泽²^,³, 史亚鸣², 王萌¹, 张晓锋², 王快社¹

1.西安建筑科技大学冶金工程学院西安 710055
2.云南钛业股份有限公司楚雄 651209
3.昆明理工大学材料科学与工程学院昆明 650093

Hot Deformation Behavior of TC4 Ti-Alloy Prepared by Electron Beam Cold Hearth Melting

WANG Wei¹^,²(

), GONG Penghui¹, ZHANG Haoze²^,³, SHI Yaming², WANG Meng¹, ZHANG Xiaofeng², WANG Kuaishe¹

1. School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
2. Yunnan Titanium Industry Co., Ltd, Chuxiong 651209, China
3. School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

引用本文:

王伟, 宫鹏辉, 张浩泽, 史亚鸣, 王萌, 张晓锋, 王快社. 电子束冷床熔炼TC4钛合金的热变形行为[J]. 材料研究学报, 2020, 34(9): 665-673.
Wei WANG, Penghui GONG, Haoze ZHANG, Yaming SHI, Meng WANG, Xiaofeng ZHANG, Kuaishe WANG. Hot Deformation Behavior of TC4 Ti-Alloy Prepared by Electron Beam Cold Hearth Melting[J]. Chinese Journal of Materials Research, 2020, 34(9): 665-673.

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摘要:

使用Gleeble-3800热模拟实验机进行一系列热模拟压缩实验，研究了电子束冷床熔炼TC4钛合金在变形温度为850℃~1100℃、应变速率为0.01 s^-1~10 s^-1条件下的热变形行为。根据真应力-真应变曲线分析变形参数对流变应力的影响，分别建立电子束冷床熔炼TC4钛合金在(α+β)两相区和β单相区的Arrhenius本构模型，绘制了基于动态材料模型的热加工图。结果表明：流变应力随着温度的提高和应变速率的增大而降低；(α+β)两相区的热变形激活能Q=746.334 kJ/mol，β单相区的热变形激活能Q=177.841 kJ/mol；用相关系数法和相对平均误差分析了模型的误差，相关系数R²=0.995，相对平均误差AARE=5.04%。这些结果表明，所建立的模型较为准确，可准确预测其热变形流变应力；合金的最佳加工区域为：变形温度1000~1100℃、应变速率0.01~0.1 s^-1。

关键词 ：金属材料, 电子束冷床熔炼, TC4, 热变形, 本构模型, 加工图

Abstract：

The hot deformation behavior of electron beam cold hearth melting TC4 Ti-alloy at 850~1100℃, by strain rate 0.01~10 s^-1 were investigated through a series of thermal simulation compression experiments via Gleeble-3800 thermal simulator. According to the true stress-true strain curve, the influence of deformation parameters on rheological stress was analyzed, and the Arrhenius constitutive model and DMM processing maps was established. The results show that the flow stress decreases with the increase of deformation temperature, and the flow stress decreases with the increase of strain rate. The hot deformation activation energy was Q=746.334 kJ/mol and Q=177.841 kJ/mol for the TC4 Ti-alloys composed of (α+β) two-phase and β phase respectively. The error analysis of the model was carried out by correlation coefficient method and relative average error. The correlation coefficient R²=0.995 and the relative average error AARE=5.04%, which indicates that the established model is accurate and can accurately predict the thermal deformation flow stress. The best processing area of the alloy is within the temperature range of 1000~1100℃ and strain rate range of 0.01~0.1 s^-1.

Key words： metallic materials Electron Beam Cold Hearth Melting TC4 hot deformation constitutive model processing maps

收稿日期: 2020-04-07

ZTFLH:

TG146.2

基金资助:中国博士后基金(2019M653571)

作者简介: 王伟，男，1985年生，副教授，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.103 或 https://www.cjmr.org/CN/Y2020/V34/I9/665

图1 TC4钛合金原始铸锭的低倍组织和原始显微组织

图2 在不同温度和应变速率条件下的真应力真应变曲线

图3 高温压缩变形峰值应力与变形温度和应变速率的关系

图4 lnσ与lnε˙的关系和σ与lnε˙的关系

图5 ln[sinh(ασ)]与lnε˙的关系

图6 高温压缩变形峰值应力与变形温度的关系

图7 ln[sinh(ασ)]与lnZ的关系

图8 根据本构关系流变应力的预测值与实验值的相关性

图9 EB炉熔炼TC4钛合金的开坯轧制加工图

图10 不同变形条件下TC4钛合金的微观组织

图11 在950℃、10 s-1条件下变形后合金的宏观和微观照片

表1 用不同熔炼方式制备的TC4钛合金的热变形激活能

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