Chapter 11 - Chapter 11: Metal Alloys Applications and...

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Chapter 11: Metal Alloys Applications and Processing ISSUES TO ADDRESS. .. • How are metal alloys classified and how are they used? • What are some of the common fabrication techniques? • How do properties vary throughout a piece of material that has been quenched, for example? • How can properties be modified by post heat treatment? Chapter 11 - 1
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Cast Iron Chapter 11 - 2 Ferrous alloys with > 2.1 wt% C – more commonly 3 - 4.5 wt%C low melting (also brittle) so easy to cast Cementite decomposes to ferrite + graphite Fe 3 C Æ 3 Fe ( α ) + C (graphite) – generally a slow process Fe 3 C cementite 1600 1400 1200 1000 800 600 400 0 123456 6 . 7 L γ austenite γ + L γ +Fe 3 C α ferrite α +Fe 3 C α + γ L +Fe 3 C δ (Fe) C o , wt% C Eutectic: Eutectoid: 0.76 4.30 727°C 1148°C T (°C)
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Fe-C True Equilibrium Diagram 1600 1400 1200 1000 800 600 400 0 1234 90 L γ + L α + Graphite Liquid + Graphite (Fe) C o , wt% C 0.65 740°C T (°C) γ + Graphite 100 1153°C γ Austenite 4.2 wt% C α + γ Graphite formation promoted by •S i> 1 w t% • slow cooling Adapted from Fig. 11.2, Callister 7e . (Fig. 11.2 adapted from Binary Alloy Phase Diagrams , 2nd ed., Vol. 1, T.B. Massalski (Ed.-in-Chief), ASM International, Materials Park, OH, 1990.) Chapter 11 - 3
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Types of Cast Iron Chapter 11 - 4 Adapted from Fig. 11.3(a) & (b), Callister 7e . Gray iron graphite flakes weak & brittle under tension stronger under compression excellent vibrational dampening wear resistant Ductile iron add Mg or Ce graphite in nodules not flakes matrix often pearlite - better ductility
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Types of Cast Iron Chapter 11 - 5 Adapted from Fig. 11.3(c) & (d), Callister 7e . White iron <1wt% Si so harder but brittle more cementite Malleable iron heat treat at 800-900ºC graphite in rosettes more ductile
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Steels Chapter 11 - 6 Based on data provided in Tables 11.1(b), 11.2(b), 11.3, and 11.4, Callister 7e . Low Alloy High Alloy low carbon <0.25wt%C med carbon 0.25-0.6wt%C high carbon 0.6-1.4wt%C Uses auto struc. sheet bridges towers press. vessels crank shafts bolts hammers blades pistons gears wear applic. wear appl. drills saws dies high T application turbines furnaces corrosion resistant Example 1010 4310 1040 4340 1095 4190 304 Additions none Cr,V Ni, Mo none Cr, Ni Mo none Cr, V, Mo, W Cr, Ni, Mo plain HSLA plain heat treatable plain tool austenitic stainless Name Hardenability 0 + + ++ ++ +++ 0 TS -0 + + ++ + + 0 EL ++ 0 - - - - + + increasing strength, cost, decreasing ductility
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This note was uploaded on 07/13/2008 for the course MSE 201 taught by Professor Nieh during the Spring '07 term at University of Tennessee.

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Chapter 11 - Chapter 11: Metal Alloys Applications and...

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