Effects of hydrogen on fatigue life of Ti-4Al-2V titanium alloy
- 1. Metallic Material Department of Sichuan University, Chengdu (China)
- 2. Chengdu Aircraft Industrial (group) Corporation, Chengdu (China)
- 3. Nuclear Power Institute of China, Chengdu (China)
Description
Four hydrogen contents had been employed to investigate the effects of hydrogen on fatigue life of Ti-4Al-2V titanium alloy by means of section-varied samples. Results revealed that the fatigue life of hydrogen-charged materials is higher than that of natural hydrogen material provided that fatigue load Δ σ is over 550 MPa. At higher Δ σ, content of hydrogen has small effects on fatigue life within 116∼280 μg/g, but the fatigue life declines with the rise of hydrogen content in case of lower Δ σ. Besides, amount of hydrogen tends to influence the crack initiation site. Explanation for the results is that interstitial hydrogen atoms and hydrides affecting the Persistent Slip Bands (PSB) become the cause of the decreasing in fatigue initiation life, and stress-induced precipitation of hydrides near crack tips for high hydrogen content seems being the reason of decrease in fatigue propagation life
Additional details
Publishing Information
- Journal Title
- Nuclear Power Engineering
- Journal Volume
- 24
- Journal Issue
- 4
- Journal Page Range
- p. 297-301
- ISSN
- 0258-0926
INIS
- Country of Publication
- China
- Country of Input or Organization
- China
- INIS RN
- 34084204
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- ALUMINIUM ALLOYS; CRACK PROPAGATION; FATIGUE; HYDRIDES; HYDROGEN; HYDROGEN EMBRITTLEMENT; SERVICE LIFE; TENSILE PROPERTIES; TITANIUM ALLOYS; VANADIUM ALLOYS; YIELD STRENGTH
- Descriptors DEC
- ALLOYS; ELEMENTS; EMBRITTLEMENT; HYDROGEN COMPOUNDS; LIFETIME; MECHANICAL PROPERTIES; NONMETALS; TRANSITION ELEMENT ALLOYS