| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Austenite Formation and Decomposition V: A Symposium in Memory of Prof. Mats Hillert
|
| Presentation Title |
Design of an Alumina Forming Martensitic Steel |
| Author(s) |
Carlos Capdevila-Montes, Cesar Fernandez-Jimenez, Isaac Toda-Caraballo, David San Martin-Fernandez, Christopher Petersson, Peter Kristian Mikael Szakalos |
| On-Site Speaker (Planned) |
Carlos Capdevila-Montes |
| Abstract Scope |
The only commercial steels that might match the goal of operational temperatures above 750 ºC are the so-called alumina forming austenitic stainless steel that deliver both superior corrosion and creep resistance without sacrificing the low cost and in-use properties of stainless steels. However, this class of steels are prone to stress corrosion cracking and exhibits bad swelling resistance under irradiation.
This work presents the designing of alumina forming martensitic steels suitable for this niche where a combined creep and oxidation resistance is of paramount importance. Combining thermodynamic and stacking fault energy calculations, various alloys have been designed in the following compositional range: 9-17.5 Cr, 8-14 Ni, 0.08-0.15 C and 3.5 Al (in wt %). The transformation from austenite to martensite has been evaluated using dilatometry, while the microstructures obtained have been characterized using X-ray diffraction, optical and scanning electron microscopy. Preliminary results in liquid-Pb allows are promising. |