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Metals and Alloys

Metals and Alloys. Alloys. Two definitions Combination of two or more elements Combination of two or more metallic elements Metallurgical Commercial. Alloys. Two Commercial Classifications Ferrous – Iron as base metal Nonferrous – No iron in composition. Alloys In Metals. Compounds

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Metals and Alloys

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  1. Metals and Alloys

  2. Alloys • Two definitions • Combination of two or more elements • Combination of two or more metallic elements • Metallurgical • Commercial

  3. Alloys • Two Commercial Classifications • Ferrous – Iron as base metal • Nonferrous – No iron in composition

  4. Alloys In Metals • Compounds • Chemically bonded • Distinct from its constituents • Mixtures • Not chemically bonded • Retains individual identity of ingredients • Solutions • Liquid • Solid

  5. Properties of Metals • Chemical • Physical • Mechanical

  6. Mechanical Properties • Hardness • Hardenability • Brittleness

  7. Mechanical Properties • Ductility • Malleability • Toughness

  8. Mechanical Properties • Machinability • Strength • Tensile strength

  9. Mechanical Properties • Yield point • Elongation • Stress

  10. Mechanical Properties • Strain • Elasticity • Plasticity

  11. Mechanical Properties • Fatigue • Fusibility

  12. Metal Identification • Steel Numbering Systems • SAE – society of automotive engineers • AISI – American iron and steel institute • Four and maybe Five digit code system • Page 507 in textbook • Note the small percentages

  13. Metal Identification

  14. Metal Identification • C = carbon • Cr = chromium • Mn = Manganese • Mo = Molybdenum • Ni = Nickel • Si = Silicon • V = Vanadium

  15. Metal Identification • First number indicates type of steel • Second number approx. % of dominate element • Third and fourth digit denotes % of carbon in hundredths • 1018 = Carbon steel with .18% of carbon content

  16. Metal Identification - Aluminum • Alloy types designated by four digit system • 1=aluminum 99% pure or better • 2=copper • 3=manganese • 5=magnesium • 6=magnesium and silicon • 7=zinc • 8=something else • 9=unassigned

  17. Metal Identification - Aluminum • Temper designations • F = as fabricated • O = annealed • H = strain hardened • W = solution heat-treated only • T = thermally treated

  18. Metal Identification • Numbering systems for metals can be found on Internet, libraries, Machinery Handbook, ASTM reference manuals, metallurgy references, textbooks on machining, casting, welding, blacksmithing, SAE references, engineering references, steel construction references, engineering materials references, metal fabrication references, steel supply distributors, steel mills…

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