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Effect of Heat Treatment on Electrochemical Corrosion Behavior of Selective Laser Melted Ti6Al4V Alloy |
ZHANG Rui1,LI Yu2(),GUAN Lei3,WANG Guan3,WANG Fuyu1 |
1. Shenyang Aircraft Design & Research Institute, Shenyang 110035, China 2. Guangdong Industrial Analysis and Testing Center, Guangzhou 510650, China 3. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China |
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Abstract Ti6Al4V alloy was selectively laser melted (SLM) to produce the deposited alloy and which was subsequently heat treated at 800 ℃ to optimize its microstructure. The electrochemical corrosion behavior of the as deposited and post-heat treated Ti6Al4V alloys was investigated in 3.5% (mass fraction) NaCl solution. The results show that the as deposited alloy composes of dominantly acicular α'-martensite and some prior β-grains. After heat treatment, the microstructure transforms to a combination of lath-like α-phase and residual β-phase. Both alloys exhibit spontaneous passivation in 3.5%NaCl solution. Based on the polarization behavior, it is evident that the influence of heat treatment on the cathodic process is insignificant. However, the anodic reaction rate is greatly reduced, which results in the significant decrease of corrosion rate and ennoblement of open circuit potential and corrosion potential. In both cases, a protective film on the alloy surface is confirmed. However, the passive film formed on the heat-treated alloy is much thicker and compact. The polarization resistance of Ti6Al4V alloy after heat treatment is 3.8 times higher than that of the as deposited ones. Our results suggest that the as deposited Ti6Al4V alloy produced by SLM should undergo suitable heat treatment in order to prolong its service life in corrosive circumstances.
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Received: 04 November 2018
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Fund: National Natural Science Foundation of China(51701047) |
Corresponding Authors:
Yu LI
E-mail: yuli11s@alum.imr.ac.cn
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