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PHASE DIAGRAMS - Coggle Diagram
PHASE DIAGRAMS
Heat Treatment Processes
Annealing
Full Annealing, Stress Relief
Normalizing
Refines grain, improves machinability
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Tempering
Reduces brittleness, improves toughness
Case Hardening
Carburizing (Pack, Liquid, Gas)
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Flame Hardening, Induction Hardening
Fundamentals
Atomic Structure
Protons, Neutrons, Electrons
Atomic Number (Z), Atomic Mass (A)
Types of Bonds
Primary: Ionic, Covalent, Metallic
Secondary: Van der Waals, Hydrogen
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Imperfections
Point Defects: Vacancy, Interstitial, Substitutional, Frenkel, Schottky
Line Defects: Edge, Screw, Mixed Dislocations
Plane Defects: Grain, Twin boundaries
Volume Defects: Pores, Cracks
Fe–Fe₃C Phase Diagram
Phases
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δ-ferrite (BCC, high-temp)
Critical Reactions
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Eutectoid: γ → α + Fe₃C (Pearlite, 723°C)
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Classification
Pure Iron, Low/Medium/High Carbon Steel, Cast Iron
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Alloys & Solid Solutions
Definition:
Mixture of ≥ 2 elements, at least 1 metal
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Phase Diagrams
Key Terms
Phase, System, Components, Variables
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Phase Rule (Gibbs Rule)
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Degrees of Freedom (F=0,1,2)
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Special Binary Systems
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Microstructure Formation
Cooling curves, Lamellar structures
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