| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Advanced Steel Metallurgy
|
| Presentation Title |
Silicide Strengthened Ferritic Alloy - A New Method of Wear Protection in Nuclear Environments |
| Author(s) |
Rahul Unnikrishnan, David Bowden, Michael Preuss |
| On-Site Speaker (Planned) |
Rahul Unnikrishnan |
| Abstract Scope |
Cobalt-based alloys have been traditionally used for hard facing applications in pressurized water reactors. There has been an interest in developing cobalt-free hard facing alloys as cobalt wear debris transported to reactor core becomes reactive 60Co, increasing radiation levels. A high-hardness intermetallic phase, named π-ferro-silicide, was recently discovered in a stainless steel hard facing alloy. This study involves developing cobalt and carbon-free silicide based hard facing alloys. Two high strength silicide based alloys, one with a duplex ferrite/silicide and other with a triplex ferrite/austenite/silicide phase has been developed. These high strength alloys can accommodate more than 20% of compressive strain while showing maximum strengths of 1.5-1.75 GPa. The high strength is a result of uniformly distributed fine precipitates of silicide phase in ferrite matrix achieved by thermo-mechanical processing. Also, the orientation relationship between silicide and ferrite interface make these alloys promising material for wear-resistant applications. |