MET 34800 - Engineering Materials Chapter 15

MET 34800 - Engineering Materials Chapter 15 - MET 34800...

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Unformatted text preview: MET 34800 ENGINEERING MATERIALS IUPUI ENGINEERING TECHNOLOGY ENT Department CHAPTER 15 TOOL STEELS Engineering Materials: properties and selection, 9th ed. Kenneth G. Budinski, Michael K. Budinski Upon completion of this chapter, the student should: have an understanding of the metallurgy of tool steels have an knowledge of the properties of the various types of tool steels and selection have an understanding of how to specify tool steels and their heat treatments CHAPTER GOALS 3 History of tool steels where they came from Definition Tool steel categories US AISI/SAE designation system UNS/ASTM designation system 15.1 IDENTIFICATION AND CLASSIFICATION 4 Figure 151 Tool steel categories 15.1 IDENTIFICATION AND CLASSIFICATION 5 Table 151 Tool steels 15.1 IDENTIFICATION AND CLASSIFICATION 6 Table 152 UNS identification number of U.S. tool steels 15.1 IDENTIFICATION AND CLASSIFICATION 7 Comparison with carbon and alloy steel Micro-constituent comparison Carbide size and volume fraction Comparison with cermets 15.2 TOOL STEEL METALLURGY 8 Figure 152 Comparison of some of the metallurgical characteristics of tool steels with those of carbon and alloy steels 15.2 TOOL STEEL METALLURGY 9 Figure 153 Carbide morphologies common in various tool materials: tools steels (type I to IX) and cermets (a) to (d) 15.2 TOOL STEEL METALLURGY 10 Figure 154 Carbide particle distribution in several tool steels (a) Type D2, (b) type A2, (c) type A7, and (d) type M3 (the white particles are carbides). 15.2 TOOL STEEL METALLURGY 11 Figure 155 Microstructure of a steel-bonded carbide (cermet) at The matrix is a martensitic, stainless steel (black). There is about 45 volume % titanium carbide (TiC) phase present for wear resistance. The TiC is about twice as hard as the stainless steel matrix. These cermets are made with powder metal (P/M) techniques 15.2 TOOL STEEL METALLURGY 12 Composition similarities Cold work grades Water hardening (W1) Oil hardening (01, 02, 06, 07) Medium alloy air hardening (A2, A4, A6, A7, A8, A9, A10, A11) PM grades (A11) High carbon, high chromium (D2, D4, D5, D7) Shock resisting grades (S1, S2, S4, S5, S6, S7) Hot work tool steels (H10, H11, H12, H13, H14, H19, H21, H22, H23, H24 H26, H42) High speed tool steel (M1, M2, M31, M32, M4, M42, M50, T15) Mold steels (P6, P20, P21) 15.3 CHEMICAL COMPOSITION OF TOOL STEELS 13 Figure 156 Comparative nominal chemical compositions of tool steels 15.3 CHEMICAL COMPOSITION OF TOOL STEELS 14 15.3 CHEMICAL COMPOSITION OF TOOL STEELS Cold Work: Water-Hardening Grades Three grades of water-hardening tool steels (W) are in common use in the United States: Nominal Composition (Wt. %)* Type C Cr V W1 0.61.4 W2 0.61.4 0.25 W5 1.1 0.5 *Iron is the remainder in this and subsequent lists....
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This note was uploaded on 12/01/2010 for the course MET 34800 taught by Professor Flechinsine during the Spring '10 term at IUPUI.

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MET 34800 - Engineering Materials Chapter 15 - MET 34800...

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