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The characterization of corrosion resistance in the Ti-6Al-4V alloy fusion zone using a gas tungsten arc welding process

Published online by Cambridge University Press:  31 January 2011

L.M. Wang  and
H.C. Lin
L.M. Wang*
Affiliation:
Department of Power Vehicle and System Engineering, Graduate School of Defense Science, Chung Cheng Institute of Technology, National Defense University, Tao-Yuan 33509, Taiwan, Republic of China
H.C. Lin
Affiliation:
Department of Power Vehicle and System Engineering, Graduate School of Defense Science, Chung Cheng Institute of Technology, National Defense University, Tao-Yuan 33509, Taiwan, Republic of China
*
a) Address all correspondence to this author. e-mail: johnny.ic.wang@gmail.com
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Abstract

The Ti-6Al-4V sheet alloys were welded by using a common gas tungsten arc welding process. In this work, we study the correlation of corrosion resistance and oxide layer structure produced after commonly used industrial heat treatments. We also study the oxide scales that were formed as a result of the heat-related treatment/aging process. The results indicate that better corrosion resistance of the Ti-6Al-4V alloy weldment can be obtained and significantly improved by a solution treatment plus an artificial aging (ST+AA) treatment, owing to the enhanced intensity of TiO2, V2O5, and Al2O3 oxides that compacted and grew on the surface of fusion zone. The newly found γ-TiAl and α2-Ti3Al particles that nucleated in the fusion zone due to different heat treatments do affect the composition of the oxide layer. The possible mechanism for this oxide layer formation in the fusion zone is discussed.

Keywords

OxideTransmission electron microscopy (TEM)Welding
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 12 , December 2009 , pp. 3680 - 3688
Copyright
Copyright © Materials Research Society 2009

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References

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