lecture-alloy-pdf - : Metal 11 Chapter Alloys Applications...

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Unformatted text preview: : Metal 11 Chapter Alloys Applications and Dr. Mubarak ١ Applications and Processing ISSUES TO ADDRESS... How are metal alloys classified and how are they used? What are some of the common fabrication techniques? Dr. Mubarak ٢ How do properties vary throughout a piece of material that has been quenched, for example? How can properties be modified by post heat treatment? Definitions: Components and Phases Dr. Mubarak ٣ Steel Dr. Mubarak ٤ Refinement of Steel from Ore Dr. Mubarak ٥ Ferrous Alloys Iron containing – Steels - cast irons Nomenclature AISI (American Iron and Steel Institute) & SAE (Society of Auotomotive Engineers) 10xx Plain Carbon Steels 11xx Plain Carbon Steels (resulfurized for machinability) 15xx Mn (10 ~ 20%) Dr. Mubarak ٦ 15xx Mn (10 ~ 20%) 40xx Mo (0.20 ~ 0.30%) 43xx Ni (1.65 - 2.00%), Cr (0.4 - 0.90%), Mo (0.2 - 0.3%) 44xx Mo (0.5%) where xx is wt% C x 100 Example : 1060 steel – plain carbon steel with 0.60 wt% C Stainless Steel -- >11% Cr Cast Iron Ferrous alloys with > 2.1 wt % C • more commonly 3 - 4.5 wt % C low melting (also brittle) so easiest to cast ٧ Dr. Mubarak Cementite decomposes to ferrite + graphite Fe 3 C 3 Fe ( ) + C (graphite) • generally a slow process C True Equilibrium Diagram- Fe ٨ Dr. Mubarak Types of Cast Iron Gray iron ( C, Si, Fe) graphite flakes. weak & brittle under tension stronger under compression excellent vibrational dampening ٩ Dr. Mubarak Ductile iron add Mg or Ce (Cerium) graphite in nodules not flakes matrix often pearlite - better ductility wear resistant White iron...
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lecture-alloy-pdf - : Metal 11 Chapter Alloys Applications...

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