Effect of Microstructure on High-Temperature Mechanical Behavior of Nickel-Base Superalloys for Turbine Disc Applications

Abstract:

The objective of this work was to establish relationships between alloy microstructure and high temperature mechanical properties such as strength, creep, and creep crack growth in Nickel-base powder metallurgy superalloys. Systematic variations of super solvus heat-treatments generated test material from three next-generation turbine disc alloys. Quantification of key microstructural features such as γ’ distribution and morphology and grain boundary serrations was coupled with mechanical testing results in order to optimize microstructure for operating conditions specific to the bore region.

• Periodical: Advanced Materials Research (Volume 278)
• Pages: 259-264
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.278.259
• Online since: July 2011
• Authors: Heather J. Sharpe, Ashok Saxena
• Keywords: Mechanical Property, Microstructure, Nickel Base, PM Superalloys

References

[1] T. Gabb, J. Gayda, J. Falsey, Forging of Advanced Disk Alloy LSHR,. NASA T/M 2005-213649, (2005).

[2] H. Sharpe. Effect of Microstructure on High-Temperature Mechanical Behavior of Nickel-Base Superalloys for Turbine Disc Applications. Diss. Georgia Institute of Technology, (2007).

DOI: 10.4028/www.scientific.net/amr.278.259

[3] ASTM Standard E8, ASTM International, (2004).

[4] T. Gabb, J. Gayda, J. Telesman, P. Kantzos, Thermal and Mechanical Property Characterization of the Advanced Disk Alloy LSHR,. NASA T/M 2005-213645, (2005).

[5] ASTM Standard E139-00, ASTM International, (2000).

[6] ASTM Standard E1457, ASTM International, (2000).