脉冲电流对0.27%置氢Ti-6Al-4V合金变形行为的影响

doi:10.11901/1005.3093.2017.450

材料研究学报

2018, Vol. 32

Issue (5): 321-326 DOI: 10.11901/1005.3093.2017.450

研究论文

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脉冲电流对0.27%置氢Ti-6Al-4V合金变形行为的影响

赵志勇^1,², 侯红亮¹(

), 张艳苓¹, 吴凡³, 王国峰²

1 北京航空制造工程研究所北京 100024
2 哈尔滨工业大学金属精密热加工国家级重点实验室哈尔滨 150001
3 大连理工大学材料科学与工程学院大连 116085

Effect of Applied Pulse Current on Deformation Behavior of Ti-6Al-4V Alloy Charged with 0.27% H

Zhiyong ZHAO^1,², Hongliang HOU¹(

), Yanling ZHANG¹, Fan WU³, Guofeng WANG²

1 Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China
2 National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China
3 School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, China

引用本文:

赵志勇, 侯红亮, 张艳苓, 吴凡, 王国峰. 脉冲电流对0.27%置氢Ti-6Al-4V合金变形行为的影响[J]. 材料研究学报, 2018, 32(5): 321-326.
Zhiyong ZHAO, Hongliang HOU, Yanling ZHANG, Fan WU, Guofeng WANG. Effect of Applied Pulse Current on Deformation Behavior of Ti-6Al-4V Alloy Charged with 0.27% H[J]. Chinese Journal of Materials Research, 2018, 32(5): 321-326.

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摘要:

对0.27%(质量分数)置氢Ti-6Al-4V合金进行压缩试验,对断口进行观察与分析,研究了脉冲电流对其变形行为的影响。结果表明,脉冲电流使0.27%置氢和未置氢Ti-6Al-4V合金的变形抗力降低和压缩延伸率提高。脉冲电流产生的焦耳热效应,是影响0.27%置氢Ti-6Al-4V合金力学性能变化的主要原因。由于电致塑性效应的影响,Ti-6Al-4V合金的断裂形式由延性脆性沿晶断裂向准解理穿晶断裂转变,但是对于0.27%置氢Ti-6Al-4V合金,由于在低温条件下氢脆的影响其准解理断裂特征不如未置氢Ti-6Al-4V合金的明显。

关键词 ：金属材料, Ti-6Al-4V合金, 脉冲电流, 压缩变形, 置氢

Abstract：

The effect of applied pulse current on the deformation behavior of Ti-6Al-4V alloy charged with 0.27% H (mass fraction) was investigated by compression test, while the fractured surface was characterized by SEM. Results show that the mechanical property of Ti-6Al-4V alloy with and without charge of 0.27% H are both improved by the applied pulse current, i.e. the decrease of deformation resistance and increase of compression elongation. Joule heating effect of the pulse current is the main reason for the mechanical property change of Ti-6Al-4V alloy with charge of 0.27% H. The fracture mode of Ti-6Al-4V alloy changed from brittle intergranular fracture to quasi cleavage transgranular fracture due to the action of electro-plastic effect. But the quasi cleavage fracture characteristics of the Ti-6Al-4V alloy with charge of 0.27% H is not so obvious as that of the as-received alloy due to the apparent hydrogen embrittlement at low temperature.

Key words： metallic materials Ti-6Al-4V alloy pulse current compression deformation hydrogenation

收稿日期: 2017-07-26

基金资助:资助项目国家自然科学基金(51405457, 51605458)

作者简介:

作者简介赵志勇,男,1988年生,博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2017.450 或 https://www.cjmr.org/CN/Y2018/V32/I5/321

图1 原始Ti-6Al-4V合金和0.27%置氢Ti-6Al-4V合金的显微组织

图2 压缩试验中的应力-应变曲线

图3 不同条件下延伸率、压缩强度和屈服强度的对比

图4 压缩试样的温度随应变量的变化

图5 不同氢含量试样的压缩断口形貌

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