Abstract
Two nitride-strengthened reduced activation martensitic (RAFM) steels with different Mn contents were investigated. The experimental steels were designed, based on the Eurofer 97 steel, but the C content was reduced to an extremely low level. The steel with low Mn content (0.47 wt.%) could not obtain a full martensitic microstructure due to the inevitable δ-ferrite independent of cooling rate after soaking. This steel showed similar room temperature strength and higher strength at 600°C, but lower impact toughness, compared with Eurofer 97 steel. Fractography of the Charpy-V notch (CVN) impact specimen revealed that the low room temperature toughness should be related to the Ta-rich inclusions initiating the cleavage fracture. The large amount of V-rich nitrides and more dissolved Cr in the matrix could be responsible for the similar strength to Eurofer 97 steel. In the second steel the Mn content was increased to 3.73 wt.% and obtained a full martensitic microstructure.
| Original language | English |
|---|---|
| Title of host publication | TMS 2011 - 140th Annual Meeting and Exhibition, Supplemental Proceedings |
| Pages | 43-50 |
| Number of pages | 8 |
| Volume | 1 |
| Publication status | Published - 26 Jul 2011 |
| Event | TMS 2011 - 140th Annual Meeting and Exhibition - San Diego, CA, United States Duration: 27 Feb 2011 → 03 Mar 2011 |
Conference
| Conference | TMS 2011 - 140th Annual Meeting and Exhibition |
|---|---|
| Country/Territory | United States |
| City | San Diego, CA |
| Period | 27/02/2011 → 03/03/2011 |
Keywords
- δ-ferrite
- Cleavage fracture
- Mechanical property
- Nitride strengthened
- RAFM steel
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys