Section 5B Heat Treatments

Section 5B Heat Treatments - How can we achieve the proper...

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MATE 210 Section 5 THERMAL TRANSFORMATIONS in Metals Heat Treatment Microstructures Properties How can we achieve the proper microstructures to get the desired properties ? Heat Treatments ! “ … sufficiently advanced technology is indistinguishable from magic.” - Arthur C. Clark
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MATE 210 Phase Transformations = Solid-State Transformations Parent (old) Phase New Phase nucleation & growth Examples: eutectoid reaction: γ→α + Fe 3 C Heat treatment σ tensile 700 MPa 2,000 MPa Previously : Strengthening Mechanisms •grain ±size • % alloy composition • cold working – strain hardening dislocations Now Phase transformations by heat treatments
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MATE 210 Iso-Thermal Transformations (Plain Carbon Steels) 1. Diffusion dependent Time at Temperature Transformations (between 727 o C to 540 o C) Course-to-fine Pearlite (ferrite + cementite) 2. Diffusion dependent Time at Temperature Transformations (between 540 o C to 215 o C) New Microstructure: Bainite (ferrite + cementite) 3. Diffusion less
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Section 5B Heat Treatments - How can we achieve the proper...

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