Abstract
1.25Cr-0.5Mo steels with different Ti-B or Al-B treatment were exposed in 18 MPa hydrogen atmosphere at 480°C for 100, 500 and 1000 h respectively. Tensile and bend properties of steels before and after hydrogen charging were tested. The results show that the different mechanical properties of the steels with different B content have different responses to high temperature, high pressure hydrogen charging processes. After hydrogen charging, more loss of ductility can be found in the steel not treated with B than those in the steels treated with B. Metallographic analyses indicated that decarburization occurs in all the steels. Furthermore, many methane bubbles were found by SEM analysis in the surface decarburization layer in the steel without B, while only a few bubbles, the number and size of which decreased with increasing B content, were found in steels with B treatment. In addition, hydrogen determination results manifested that after being exposed in hydrogen atmosphere the steel containing no B has higher hydrogen content than that of steels containing B. All this suggests that B treatment improves the HA resistance of 1.25Cr-0.5Mo steel, and the more B the steel contained the more perceptible the effect.
| Original language | English |
|---|---|
| Pages (from-to) | 233-238 |
| Number of pages | 6 |
| Journal | Acta Metallurgica Sinica Series A, Physical Metallurgy & Materials Science |
| Volume | 10 |
| Issue number | 3 |
| Publication status | Published - Jun 1997 |
| Externally published | Yes |