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

doi:10.11901/1005.3093.2017.450

Chinese Journal of Materials Research

2018, Vol. 32

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

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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

Cite this article:

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. Chinese Journal of Materials Research, 2018, 32(5): 321-326.

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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

Received: 26 July 2017

Fund: Supported by National Natural Science Foundation of China (Nos. 51405457 & 51605458)

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	Zhiyong ZHAO
	Hongliang HOU
	Yanling ZHANG
	Fan WU
	Guofeng WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.450 OR https://www.cjmr.org/EN/Y2018/V32/I5/321

Fig.1 Microstructure of materials with H addition 0.27% H (a) as-received Ti-6Al-4V alloy; (b) Ti-6Al-4V alloy with 0.27% H

Fig.2 Stress-strain curves in compression tests (a) without H,

ε ˙

=0.01 s^-1; (b) without H,

ε ˙

=0.03 s^-1; (c) 0.27% H,

ε ˙

=0.01 s^-1; (d) 0.27% H,

ε ˙

=0.03 s^-1

Fig.3 Variations of compressive strength, compression elongation and yield stress (a)

ε ˙

=0.01 s^-1 elongation; (b)

ε ˙

=0.03 s^-1 elongation; (c)

ε ˙

=0.01 s^-1 yield stress and compressive strength; (d)

ε ˙

=0.03 s^-1 yield stress and compressive strength

Fig.4 Temperature change with strain of compression samples (a) 50 V; (b) 60 V; (c) 70 V

Fig.5 Fracture morphology of (a) without H,

ε ˙

=0.01 s^-1, 0 V; (b) without H,

ε ˙

=0.03 s^-1, 70 V; (c) 0.27% H,

ε ˙

=0.01 s^-1, 0 V; (d) 0.27% H,

ε ˙

=0.03 s^-1, 70 V

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