Development of gamma' precipitation strengthened W free Co base superalloys for gas turbine applications
Abstract
Superalloys strengthened by precipitates show outstanding high-temperature properties such as creep, oxidation, and hot corrosionresistance and are therefore the key materials in jet propulsion gas turbines. Recently, Co-based superalloys have attracted a greatdeal of attention for high-temperature applications. The interest in these new emerging alloys was triggered by the discovery of a /microstructure in the ternary Co-Al-W system, which is very similar to that of high-performance Ni-based superallloys. However, themain drawbacks of Co-Al-W-based superalloys are a limited phase stability and relatively low solvus temperatures (usually below ~1300 K). Moreover, they show a high density (about 10% higher than commercial Ni-alloys) due to the high amount of W (~ 10 at.%),which limits creep rupture life. The aim of this project is to develop new -strengthened alloys based on the Co-Ti system instead of Co-Al-W.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 07, 2020
- Accession Number
- AD1111661
Entities
People
- Pyuck-Pa Choi
Organizations
- KAIST