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materials lecture 8

  1. iron containing compounds exist in abundant quantities within the earths crust 

    iron and its alloys may be produced using relatively economical techniques

    ferrous alloys - properties
    extremely versatile and may be tailored to have a wide range of mechanical and physical properties due to heat treatments
  2. how are metal alloys classified
    ferrous and non ferrous
  3. how are ferrous alloys classified
    steels and cast irons
  4. how are cast irons classified
    • grey iron 
    • ductile iron 
    • white iron 
    • malleable iron 
    • compacted graphite iron
  5. how are steels classified
    low alloy and high alloy
  6. how are low alloys classified
    • low carbon 
    • medium carbon 
    • high carbon
  7. how are high alloys classified
    • tool 
    • stainless
  8. how are low carbon steels classified
    plain or high strength low alloy
  9. how are medium carbon steels classified
    plain or heat treatable
  10. how are high carbon steels classified
    plain or tool
  11. what are the limitations of ferrous alloys
    • relatively high densities 
    • relatively low electrical conductivities 
    • generally low corrosion resistance
  12. draw an iron carbon phase diagram
    Image Upload 1
  13. classification of wt% C for steels
    <1.4wt%C
  14. classification of wt% C for cast irons
    3-4.5wt%C
  15. low carbon wt%C
    <0.25wt%C
  16. medium carbon
    0.25-0.6wt%C
  17. high carbon wt%C
    0.6-1.4wt%C
  18. as you add more carbon to steel
    you increase the strength and cost but reduce ductility
  19. plain low carbon steels properties
    • contain less than 0.25wt%C 
    • not very responsive to heat treatments 
    • soft 
    • weak 
    • tough 
    • ductile 
    • machinable 
    • weldable 
    • cheap
  20. high strength low alloy steels properties
    • contain alloying elements such as Cu,V,Ni,Mo in combined concentrations of <10wt%
    • can be heat treated but only in thin sections 
    • stronger than low-C steels but less ductile and less tough 
    • Goof wear resistance
  21. high strength low alloy steel properties
    railway wheels & tracks
  22. high carbon steels properties
    • 0.6-1.4wt%C
    • hardest, strongest, least ductile of steels 
    • almost always used in tempered conditions 
    • especially wear resistant 
    • form hard and wear resistant carbides with alloying elements
  23. high carbon steels properties
    • cutting tools 
    • dies
  24. stainless steels properties
    highly resistant to corrosion in many environments
Author
ghoran
ID
329079
Card Set
materials lecture 8
Description
uni year 1 materials module
Updated

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