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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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- Summer '07
- Materials Science, Tensile strength, Austenite, TTT diagram, following TTT diagram