Based on the following Time-Temperature transformation diagram for an iron-carbon alloy of eutectoid composition (Figure Q2a),...
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Based on the following Time-Temperature transformation diagram for an iron-carbon alloy of eutectoid composition (Figure Q2a), determine the final microstructure of a small specimen that has been subjected to the following time-temperature treatments (1), (2), (3), and (4), as shown in the Figure Q2a. In each case assume that the specimen temperature begins at around 760 oC, and that it has been held at this temperature long enough to have achieved a complete and homogeneous Austenitic structure. Q2) Two previously un-deformed cylindrical specimens of brass are to be cold worked by reducing their cross-sectional areas (while maintaining their circular cross- sections). For the first specimen, the initial and deformed radii are 16 and 11 mm, respectively. The second specimen, with an initial radius of 12 mm, must have the same deformed hardness as the first specimen. Calculate the second specimen's radius after deformation. Q3)The alloy is cooled down to 720 °C, please answer the following questions: How many phases are present and what are their names? For the phases identified above, what are their compositions for each phase? Sketch the micrograph, taking into account the features of the phase diagram. What is the weight fraction of each phase? What is the weight fraction for pearlite in the alloy? Temperature (°C) 800 700 600 500 400 300 200 100 0 10-1 A M (start) A M (50%) M (90%) (1) 1 P-X (2) 10 Eutectoid temperature M + A P B (3) 50% 10² Time (s) Figure Q2a: TTT diagram of Fe-C alloy. (4) 10³ 104 1400 1200 1000 800 600 400 200 10⁰ Temperature (°F) Based on the following Time-Temperature transformation diagram for an iron-carbon alloy of eutectoid composition (Figure Q2a), determine the final microstructure of a small specimen that has been subjected to the following time-temperature treatments (1), (2), (3), and (4), as shown in the Figure Q2a. In each case assume that the specimen temperature begins at around 760 oC, and that it has been held at this temperature long enough to have achieved a complete and homogeneous Austenitic structure. Q2) Two previously un-deformed cylindrical specimens of brass are to be cold worked by reducing their cross-sectional areas (while maintaining their circular cross- sections). For the first specimen, the initial and deformed radii are 16 and 11 mm, respectively. The second specimen, with an initial radius of 12 mm, must have the same deformed hardness as the first specimen. Calculate the second specimen's radius after deformation. Q3)The alloy is cooled down to 720 °C, please answer the following questions: How many phases are present and what are their names? For the phases identified above, what are their compositions for each phase? Sketch the micrograph, taking into account the features of the phase diagram. What is the weight fraction of each phase? What is the weight fraction for pearlite in the alloy? Temperature (°C) 800 700 600 500 400 300 200 100 0 10-1 A M (start) A M (50%) M (90%) (1) 1 P-X (2) 10 Eutectoid temperature M + A P B (3) 50% 10² Time (s) Figure Q2a: TTT diagram of Fe-C alloy. (4) 10³ 104 1400 1200 1000 800 600 400 200 10⁰ Temperature (°F)
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Related Book For
Materials Science and Engineering An Introduction
ISBN: 978-0470419977
8th edition
Authors: William D. Callister Jr., David G. Rethwisch
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