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# Homework06 - for the following temperatures 500˚C 270˚C...

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MECH340: Engineering Materials Homework 6 on Heat Treatment (submission for Friday, May 4, 2007) 1. TTT Diagram [25 points] For the following TTT diagram, find the final composition for the following heat treatments a) Cool rapidly to 250ºC hold for 1000 sec then quench to room temperature. b) Cool rapidly to 650ºC, hold for 3 sec, then rapidly cool to 400ºC, hold for 4 sec, then quench to room temperature. c) Cool rapidly to 400ºC hold for 500 sec then quench to room temperature.

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2. Phase Diagram[25 points] Using the phase diagram for MgPb with a composition of 70% Mg sketch and the microstructure and compute the composition and percent weight of the phases present
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Unformatted text preview: for the following temperatures 500˚C, 270˚C and 200˚C 3. Problem 3(25 points). Is it possible to produce an iron-carbon alloy that has a minimum tensile strength of 620 MPa and a minimum ductility of 50%? If so what will be the composition and microstructure (coarse and fine pearlites, spheroidite etc . .)? If this is not possible, explain why 4. Problem 4 (25 points). (a) For a 1080 steel that has been water quenched, estimate the tempering time at 425˚C to achieve a hardness of 50 HRC (b) What will be the tempering time at 315˚C necessary to attain the same hardness....
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Homework06 - for the following temperatures 500˚C 270˚C...

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