Abstract
Steel (2 1/4 Cr-1Mo) and, for comparison, Armco iron were hydrogenated electrochemically in glycerine-phosphoric acid (2:1) electrolyte at 55°C. The microstructure was studied by optical microscopy and transmission electron microscopy. Compression tests at elevated temperatures of 650°C showed minor changes in the compressive stress for hydrogenated Armco iron, whereas a tremendous decrease of 50% of the compressive stress in 2 1/4 Cr-1Mo steel after hydrogenation was observed, which would improve the formability during processing. Our investigations indicate that the increase in plasticity of 2 1/4 Cr-1Mo steel strongly depends on the amount of hydrogen, as well as the strain rate, which can be explained by the difference in the mobility of dislocations. The positive effects of hydrogen on the plasticity at higher temperatures and the possible mechanisms which led to the distinct decrease in the compressive stress of 2 1/4 Cr-1Mo steel in comparison to iron are discussed in detail taking into account dynamic recovery as well as recrystallization.
| Original language | English |
|---|---|
| Pages (from-to) | 809-812 |
| Number of pages | 4 |
| Journal | Journal of Alloys and Compounds |
| Volume | 356-357 |
| DOIs | |
| State | Published - 11 Aug 2003 |
| Event | Proceedings of the Eight International Symposium on Metal Hyd (MH 2002) - Annecy, France Duration: 2 Sep 2002 → 6 Sep 2002 |
Keywords
- 2 1/4 Cr-1Mo steel
- Compression test
- Dislocations
- Hydrogenation
- Softening
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry