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Superalloy

Historical, application, composition, process, properties, creep

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Superalloy

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  1. SUPERALLOYS METE 327 Fall, 2008 METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  2. OUTLINE Historical perspective Applications Compositions Processes Properties −Creep METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  3. METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  4. Applications Gas Turbine Engines −Blades, vanes, disks, combustors Space Vehicles −Rocket motors Nuclear Reactors Submarines Petroleum Equipment METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  5. METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  6. Compositions Ni, Co and Fe Based Alloys Solid solution strengthening −Cr, Mo, Al, Nb, Ti and others Precipitation strengthening −Mostly due to Al and Ti − Ni3(Al,Ti), gamma prime −Lattice mismatch, amount, size and morphology Carbide phases − M23C6, M6C or MC −M can be Cr, Ti, Mo or W METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  7. METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  8. METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  9. METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  10. METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  11. METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  12. METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  13. METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  14. METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  15. METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  16. Astroloy Microstructure (orig. 15 K X) METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  17. CREEP Deformation at high temperature under constant load Important property of Superalloys Brief discussion now, more next time METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  18. METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  19. METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  20. METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  21. METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  22. METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  23. Engineering Design Using Creep (and Stress-Rupture) Engineering Design Using Creep (and Stress-Rupture) The Larson-Miller Parameter: The Larson-Miller Parameter: Stress Rupture Data Plotted according to the following equation: equation: Stress Rupture Data Plotted according to the following Where M = log e Where M = log e and θ = t exp (-Q/RT) and θ = t exp (-Q/RT) assuming that Q and θ are functions of stress only. t can be a time to rupture or a time to a given creep strain. time to rupture or a time to a given creep strain. assuming that Q and θ are functions of stress only. t can be a METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  24. METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  25. METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  26. Assignment Please email me a question about superalloys before Monday, 17 November jacobsonla@att.net More about creep next time, and Materials Selection for Design METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  27. METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

  28. METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08

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