MET 34800 - Engineering Materials Chapter 17

MET 34800 - Engineering Materials Chapter 17 - IUPUI...

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MET 34800 – ENGINEERING MATERIALS IUPUI ENGINEERING TECHNOLOGY ENT Department
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CHAPTER 17 CAST IRON, CAST STEEL, AND POWDER METALLURGY MATERIALS Engineering Materials: properties and selection, 9th ed. Kenneth G. Budinski, Michael K. Budinski
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Upon completion of this chapter, the student should: have a knowledge of how castings are made have an understanding of the guidelines for casting design have an understanding of the various types of cast irons and steels have a knowledge of powder metals Have selection capability in ferrous castings and P/M parts CHAPTER GOALS
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What is a casting? The use of a cupola for cast iron Common casting processes sand casting permanent mold die casting shell molding investment casting centrifugal casting Tolerances Surface finish Size Limitations Applicable materials Costs Availability 17.1 CASTING PROCESSES
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17.1 CASTING PROCESSES Factors to consider before selecting casting process: 1. Tolerance 2. Surface finish 3. Size limitations 4. Materials that can be cast 5. Casting cost 6. Availability 7. Anticipated quantities 8. Wall thickness 5
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Figure 17–1 Cupola used to melt cast iron 17.1 CASTING PROCESSES
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Figure 17–2 Common casting processes 17.1 CASTING PROCESSES
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Figure 17–2 Common casting processes (continued) 17.1 CASTING PROCESSES
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Table 17–1 Tolerances for several casting processes (small parts) 17.1 CASTING PROCESSES
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Table 17–2 Shrinkage allowances for sand castings 17.1 CASTING PROCESSES
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Table 17–3 Surface roughness ranges for some casting processes 17.1 CASTING PROCESSES
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Figure 17–3 Stainless steel investment casting 17.1 CASTING PROCESSES
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Table 17–4 Hardware requirements for casting processes 17.1 CASTING PROCESSES
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Figure 17–4 Approximate melting points of some common metals Source: Courtesy of Talbot Associates, Inc. 17.1 CASTING PROCESSES
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Mechanism of solidification Potential defects Property considerations Design hints 17.2 CASTING DESIGN
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Figure 17–5 Oriented dendrites 17.2 CASTING DESIGN
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Figure 17–6 Random dendrites 17.2 CASTING DESIGN
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Figure 17–7 Fractured casting showing columnar grain structure 17.2 CASTING DESIGN
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Figure 17–8 Sources of casting defects 17.2 CASTING DESIGN
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Figure 17–9 Shrink in heavy sections 17.2 CASTING DESIGN
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