Metals Alloys 3

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Author:
Marciaho
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269869
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Metals Alloys 3
Updated:
2014-04-09 03:21:58
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Metals Alloys
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Metals Alloys 3
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Metals Alloys 3
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  1. Alloying atoms can either fit into _____ between atoms (______) or can replace atoms in lattice structure (________)
    • voids
    • interstitial
    • substitional
  2. Definition of phase
    A homegenous portion of a system that has uniform chemical and physical characteristics
  3. Phase diagram
    A graphical represntation of contraints (t,p,c) and regions of phase stability
  4. Solution is _____ phase
    single
  5. Mixtures is what phase
    More than one type
  6. If we know T and C0 then we know  (2)
    • What phases are present
    • Their compositions
  7. Steel contains three main phases at room temperatures
    • Ferrite 
    • Cementite
    • Pearlite
  8. Carbon content percentage and application
    • <0.25% Structural
    • 0.25-0.5% Reinforcing steel
    • 0.5-1.5% Pre stressing steel
    • 2.5-4.5% Ornamental work
  9. Types of annealing
    Stress relief: 

    Process anneal:

    Spheroidize

    Full Anneal (steels) 

    Normalize (steels)
  10. Heat Treatments
    • Quenching 
    • Annealing
    • Tampered Martensite
  11. Quenching/Hardening
    Steel is heated above the transformation range and held until the austenite is formed. the steel s then quenched by immersing into oil, water or brine. Rapid cooling locks the iron into a martensite BCC structure, rather than allowing transfrmation to ferrite structure
  12. Alloy agents are added to to improve: 4
    • 1. Strength
    • 2. Ductility
    • 3. Corrosion resistance
    • 4. Hardenability
  13. Alloy agents and their effects:
    • Aluminium (2.0%) Aids nitirding; remove oxygen in steel making
    • Sulfur >0.5% Adds Machinability, reduces weldability and ductility
    • Chronium resistance to corrosion, increase hardenability
    • Increases High temperature strength
    • Nickel Increases hardenability and toughness
    • Coppper
    • Manganese
    • Silicon
    • Molybdenum
    • Vanadium
  14. Aluminium
    Aluminium (2.0%) Aids nitirding; remove oxygen in steel making
  15. Sulfur
    >0.5% Adds Machinability, reduces weldability and ductility
  16. Chronium
    resistance to corrosion, increase hardenability
  17. Nickel Increases hardenability and toughness
    Increases hardenability and toughnes
  18. Silicon
    improves toughness, removes oxygen , increases hardenability
  19. Structural steel properties 3
    • Low carbon
    • High strength low allow
    • Corrosion resistant high strength low alloy
  20. Structural steel mechanical properties
    • Yield strength
    • Tensile or ultimate stress
    • Percent elongation
  21. Structural shapes
    • HP
    • S
    • C
    • L

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