MET 34800 – Engineering Materials Chapter 13

MET 34800 – Engineering Materials Chapter...

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Unformatted text preview: MET 34800 ENGINEERING MATERIALS IUPUI ENGINEERING TECHNOLOGY ENT Department CHAPTER 13 HEAT TREATMENT OF STEELS Engineering Materials: properties and selection, 9th ed. Kenneth G. Budinski, Michael K. Budinski Upon completion of this chapter, the student should: Understand all through-hardening, case-hardening, and softening process for steels. Know how to select and specify heat treating processes on engineering drawings. CHAPTER GOALS This chapter introduces the iron carbon diagram with all of its awesome power. All of the common heat treatments for steels: annealing, quench hardening, tempering are discussed. We also introduce surface hardening processes. We will also give students enough information to properly specify heat treatments. The overall chapter objective is material users with a good working knowledge of heat treating. 3 Definition Solid solutions Binary alloys, ternary, quaternary, etc. Phase diagrams Eutectic and eutectoid phases Intermetallic compounds Calculation of phases present 13.1 EQUILIBRIUM DIAGRAMS 4 Figure 131 Interstitial and substitutional solid solution 13.1 EQUILIBRIUM DIAGRAMS 5 Figure 132 Phase diagram of completely soluble metals 13.1 EQUILIBRIUM DIAGRAMS 6 Figure 133 Phase diagram of partial solid solubility 13.1 EQUILIBRIUM DIAGRAMS 7 Figure 134 Phase diagram with intermetallic compound 13.1 EQUILIBRIUM DIAGRAMS 8 Figure 135 Schematic of ternary phase diagram with three major constituents, elements A, B, and C 13.1 EQUILIBRIUM DIAGRAMS 9 Figure 136 Use of tie lines on phase diagrams to calculate relative percentages of phases that are present at a particular temperature 13.1 EQUILIBRIUM DIAGRAMS 10 Whats in steel Ferrite Pearlite Cementitie Iron carbide Fe 3 C Martensite Phases are on the iron/carbon diagram Equilibrium phases Non-equilibrium phases Reasons for heat treating Hardening Softening Conditioning Normalizing Steam treating Stress relieving Cryo treat 13.2 MORPHOLOGY OF STEEL 11 Table 131 Principal stable phases of steel 13.2 MORPHOLOGY OF STEEL 12 Figure 137 Iron carbon equilibrium phase diagram Source: Metal Progress, ASM International, 1975 Note: This is only a portion of the iron carbon equilibrium phase diagram. The far end of the abscissa is graphite (100% carbon). There is a cementite ordinate at 6.67% carbon. 13.2 MORPHOLOGY OF STEEL 13 Figure 138 Equilibrium microstructure of ironcarbon alloys at room temperature (about X500) 13.2 MORPHOLOGY OF STEEL 14 Figure 139 Microstructures of annealed carbon steel. (a) About 0.2% C. (b) About 0.6% C. The light areas are ferrite and the dark are pearlite 13.2 MORPHOLOGY OF STEEL 15...
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MET 34800 – Engineering Materials Chapter...

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