Abstract
Single crystal (SX) superalloys have wide application in the high pressure turbine section of aero and industrial gas turbine engines due to the unique combination of properties and performance. Since introduction of single crystal casting technology, SX alloy development has focused on increased temperature capability, and major improvements in alloy performance have been associated with the introduction of new alloying elements, including rhenium (Re) and ruthenium (Ru). 3% Re-containing second generation alloys have seen the greatest market utilization and have become the benchmark alloys for comparing new alloy developments. However, Re and Ru are rare elements with limited production/availability and corresponding high costs. This has resulted in significant escalation of SX alloy costs, resulting in much interest in the development of improved SX superalloys with lower Re or no Re content compared to second generation alloys. Cannon-Muskegon® has developed two new SX superalloys: 1.5% Re CMSX®-8 alloy and CMSX®-7 alloy, which contains no Re, as alternatives to first and second generation alloys for applications which require slightly less ultra high temperature capability compared to current alloys. This paper provides an overview of development and characterization of these SX alloys, including an update on recent results.
Highlights
Since the introduction of single crystal (SX) casting technology in the late 1970’s, single crystal alloy development has generally focused on increasing temperature capability
Major improvements in alloy performance have been associated with the introduction of new alloying elements, including rhenium (Re) and ruthenium (Ru) [1, 2]
High temperature creep resistance and fatigue properties are directly related to the useful service life of gas turbine components and turbine engine performance such as power output, fuel burn and carbon dioxide emissions
Summary
Since the introduction of single crystal (SX) casting technology in the late 1970’s, single crystal alloy development has generally focused on increasing temperature capability. Major improvements in alloy performance have been associated with the introduction of new alloying elements, including rhenium (Re) and ruthenium (Ru) [1, 2]. In particular, has been widely used in advanced single crystal superalloys for turbine blade, vane and seal segments due to its potent effect in slowing diffusion, creep deformation and fatigue crack initiation under high temperature operating conditions [3]. As initially presented at SUPERALLOYS 2012 [4], Cannon-Muskegon has developed two new proprietary SX superalloys: CMSX R -8 alloy containing 1.5% Re is an alternative to 2nd generation alloys for applications with slightly lower maximum temperature requirements and CMSX R -7 alloy, which contains no Re, with improved properties over 1st generation alloys, such as CMSX-2/3 R and PWA 1480
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
