The aging reactions of brittle and martensitic iron alloys containing 11-30%Cr and 0-10%Co, and 13% Cr maraging steel containing Co and Mo have been investigated. The specific heat versus temperature curves of high Cr ferritic and martensitic alloys are characterized by an evolution peak due to the formation of Cr-rich zones in the temperature range between 330 and 540 degree C, and an absorption peak due to reversion in the temperature range between 500 and 590 degree C. The amount of evolution increases with increasing content of not only Cr but also Co. The addition of Co promotes the formation of Cr-rich zones resulting in 475 degree C embrittlement. In 13% Cr maraging steel, another evolution peak due to precipitation of an intermetallic compound containing Mo appears in the temperature range between 520 and 660 degree C. Mo as well as Cr forms rich zones in the temperature range between 330 and 540 degree C on the specific heat versus temperature curve.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry