superalloysinfohost.nmt.edu/~ljacobso/superalloy slides.pdf · mete 327 physical metallurgy...
TRANSCRIPT
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
SUPERALLOYS
METE 327Fall, 2008
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
OUTLINE Historical perspective Applications Compositions Processes Properties
− Creep
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
Applications Gas Turbine Engines
− Blades, vanes, disks, combustors Space Vehicles
− Rocket motors Nuclear Reactors Submarines Petroleum Equipment
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
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
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
Astroloy Microstructure (orig. 15 K X)
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
CREEP Deformation at high temperature under
constant load Important property of Superalloys Brief discussion now, more next time
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
Engineering Design Using Creep (and Stress-Rupture)
The Larson-Miller Parameter:
Stress Rupture Data Plottedaccording to the followingequation:
Where M = log e
and θ = t exp (-Q/RT)
assuming that Q and θ are functions of stress only. t can be atime to rupture or a time to a given creep strain.
Engineering Design Using Creep (and Stress-Rupture)
The Larson-Miller Parameter:
Stress Rupture Data Plottedaccording to the followingequation:
Where M = log e
and θ = t exp (-Q/RT)
assuming that Q and θ are functions of stress only. t can be atime to rupture or a time to a given creep strain.
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
Assignment Please email me a question about superalloys
before Monday, 17 November [email protected] More about creep next time, and Materials
Selection for Design
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08
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METE 327 Physical Metallurgy Copyright 2008 Loren A. Jacobson 5/16/08