Lec 9 - ENGR ENGR 4250 Advanced Materials Engineering...

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ENGR 4250 ENGR 4250 – Advanced Materials Engineering Lecture 9 Applications & Processing of metals and alloys
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ementite is meta table Cementite is meta-stable Fe 3 C Æ 3Fe ( α ) + C (graphite) Figure 9.24
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Figure 11.2
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C < 1 % 2.14 % < C < 4.50 %
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roduction of Cast Iron Production of Cast Iron Adapted from Fig.11.5, allister 7e Callister 7e . 5
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ray Iron Gray Iron • Carbon content 2.5 < C < 4.0 wt% • Silicon content 1.0 < Si < 3.0 wt% • Corn flake like graphite structure • Fractured surface is gray • Weak and brittle in tension: sharp flake edges result in stress concentration • Good damping capacities •W e a r resistant • High fluidity in molten state : casting • Low shrinkage and low cost
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ray C. I. Gray C. I.
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amping Capacities Damping Capacities
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odular CI Nodular CI
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uctile (or Nodular) Cast Iron Ductile (or Nodular) Cast Iron mall amount of n nd/or cerium ( e Small amount of Mn and/or cerium (Ce) • Nodules in a matrix of either pearlite or rrite ferrite • Pearlite Æ ferrite (700ºC) • Stronger and ductile (steel like)
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hite Iron White Iron
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hite Iron & Malleable Iron White Iron & Malleable Iron ow Si amount <1w t% Low Si amount 1 wt% • Rapid cooling rates exist as ementite stead of graphite C exist as Cementite instead of graphite • Fracture has white appearance urface layer W I Interior G I • Surface layer W. I. Interior G.I • W.I. very hard,& very brittle ollers in rolling mill • Rollers in rolling mill • Heating at 800 – 900 C Æ Malleable iron osettes of graphite in earlite r ferrite – Rosettes of graphite in pearlite or ferrite
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alleable Iron Malleable Iron Graphite in α -ferrite matrix
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ompacted Graphite Iron Compacted Graphite Iron raphite formation promoted by Si Graphite formation promoted by Si. • Graphite has worm-like structure as well s nodules matrix ferrite or pearlite as nodules, matrix ferrite or pearlite
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ompacted Iron Compacted Iron
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teel Disadvantages Steel Disadvantages igh density High density • Low electrical conductivity • Corrosion susceptibility • Solution : non-ferrous alloys
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on Ferrous Alloys Non Ferrous Alloys ast alloy: brittle; not formable Cast alloy: brittle; not formable • Wrought alloy : formable or machineable
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opper Based Alloys Copper Based Alloys Aluminum Based Alloys Magnesium Based Alloys Titanium Based Alloys ther alloys Other alloys Refractory Metals Super alloys oble Metal Noble Metal Misc. non ferrous alloys Ni & alloys Lead & Tin and alloys
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opper Based Alloys Copper Based Alloys opper and its alloys: unalloyed Cu is soft
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This note was uploaded on 10/18/2010 for the course ENGR 3360 taught by Professor Ahmadbarari during the Fall '10 term at UOIT.

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Lec 9 - ENGR ENGR 4250 Advanced Materials Engineering...

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