Effect of hydrogen on the superplasticity of Ti40 alloy with large grains

✍ Scribed by Xuemin Zhang; Yongqing Zhao; Weidong Zeng

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 847 KB
• Volume: 527
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2010.02.021

✦ Synopsis

Thermohydrogen processing (THP) is an attractive approach which uses hydrogen as a temporary element in titanium alloys to modify the microstructure/mechanical properties and workability. In this article, the influence of hydrogen on the superplasticity of single ␤ phase Ti40 (Ti-25V-15Cr-0.2Si) alloy with hydrogenation had been investigated in the temperature range of 840-920 • C and strain rate of 5 × 10 -4 -1 × 10 -2 s -1 . The maximum elongation of 478% was obtained at 920 • C, 5 × 10 -4 s -1 with 0.3 wt.% H. A significant refinement of average grain size in Ti40-xH alloys during superplastic deformation was found and the grain sizes became much finer with the increase of hydrogen content. The superplastic deformation mechanism of Ti40-xH alloy with large grains could be explained by dynamic recovery and recrystallization.