Effect of Hydrogen as a Temporary Alloying Element on the Microstructure and Mechanical Properties of Ti-6Al-4V Titanium Alloy

Abstract:

The α + β dual-phase titanium alloy, Ti-6Al-4V, was thermohydrogen processed with 0.1, 0.3 and 0.5 wt% hydrogen. Hydrogen was removed from the hydrogenated titanium alloy by vacuum annealing. Microstructure and mechanical properties of the hydrogenated and dehydrogenated titanium alloy were investigated. Effect of hydrogen as a temporary alloying element on the microstructure and mechanical properties of Ti-6Al-4V titanium alloy was systematically discussed. It was found that hydrogen stabled the β phase and leaded to the formation of α martensite as well as δ hydride in the hydrogenated titanium alloy. Mechanical properties of hydrogenated titanium alloy deteriorated with increasing hydrogenation content. The α martensite and δ hydride decomposed during the dehydrogenation and the dehydrogenated titanium alloy only consisted of α and β phases. The mechanical properties of hydrogenated titanium alloy with different hydrogen content were recovered and were tend to be consistent after dehydrogenation.

• Periodical: Applied Mechanics and Materials (Volumes 395-396)
• Pages: 243-250
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.395-396.243
• Online since: September 2013
• Authors: Li Zhou*, Duo Liu, Hui Jie Liu, Lin Zhi Wu
• Keywords: Mechanical Property, Microstructure, Thermohydrogen Processing, Titanium Alloy

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