Abstract
In this paper the phenomena of hydrogen cracking and hydrogen-induced second phases formation in titanium based alloys is discussed, addressing to two different alloys; the alpha+beta Ti-6Al-4V alloy and the Ti-20 wt%Nb refractory alloy. The prior microstructure of the alloy plays a very significant role on its behavior under exposure to a hydrogen-containing environment In the Ti-6Al-4V alloy the main mechanism of hydrogen cracking is the formation and rupture of brittle titanium hydride phases. The severity of hydrogen degradation in the Ti-6Al-4V alloy depends on the amount and distribution of the β phase in the microstructure due to a more rapid diffusion transport of hydrogen in the bcc β phase. In the Ti-20 wt%Nb alloy hydrogen-induced phase transitions and hydrides formation were followed by an interesting softening effect, irrespective of the charging procedure.
Original language | English |
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Pages (from-to) | 13-16 |
Number of pages | 4 |
Journal | Metalurgia International |
Volume | 14 |
Issue number | SPEC. ISS. 3 |
State | Published - 26 Mar 2009 |
Keywords
- Cracking
- Hydrides
- Ti-6Al-4V
- Ti-Nb alloys
- Titanium alloys
ASJC Scopus subject areas
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry