Name the microstructural products of a eutectoid iron-carbon alloy (0.76 wt% C ) that is first completely transformed to austenite and then cooled to room temperature at a rate of 100 °C/s
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Name the microstructural products of a eutectoid iron-carbon alloy (0.76 wt% C ) that is first completely transformed to austenite and then cooled to room temperature at a rate of 100 °C/s
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- How much time in seconds is required for austenite to transform to 50% pearlite at 600°C?4b) Figure 6 shows the Fe-Fe3C phase diagram. Evaluate (i) the temperature at which austenite first begins to transform on cooling; (ii) the primary microconstituent that forms; (iii) the composition and amount of each phase present at 728°C; (iv) the composition and amount of each phase present at 726°C; (v) Sketch the evolution of the microstructures of hypereutectoid steels with 1.1 wt% of carbon during the cooling in relationship to Fe-Fe3C phase diagram shown at 900°C, 800°C and 500°C, respectively.14- On the basis of accompanying isothermal transformation diagram for a 0.45 wt% C iron- carbon alloy, specify the nature of the final microstructure for the following heat treatments after austenitizing the sample at 775°C: a. Rapidly cool to about 590°C (just above the doted line), hold at this temperature for 10 s, and then rapidly quench to room temperature. b. Rapidly cool the specimen to about 675°C, hold at this temperature for 1000 s, then rapidly quench to room temperature. c. Reheat the specimen in part (b) to 700°C (1290°F) for 20 h then slowly cool to room temperature. d. Rapidly cool to about 400°C, hold at this temperature for about 1 s, and then rapidly quench to 295°C and hold for 1000 s then slow cooling. e. Rapidly cool to room temperature then reheat to 425°C for 4000 s then slowly cool to room temperature. Temperature (°C) 900 800 700 600 500 400 300 200 100 0 0.1 A A M(start) M(50%) M(90%) 1 A+ F B 10 A + P A + B *50% 10² Time (s) 10³ 104 1600 1400 1200 1000 800…
- How much time (in seconds) is required for austenite to transform to 50% bainite at 300°C?. Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition, specify the nature of the final composition in terms of microconstituents present and approximate percentages: a) Rapidly cool to 350 oC, hold for 104 s, and quench to room temperature. b) Rapidly cool to 250 oC, hold for 100 s, and quench to room temperature. c) Rapidly cool to 650 oC, hold for 20 s, rapidly cool to 400 oC, hold for 103 s, and quench to room temperature.2 By using the Iron - Carbon diagram that you have. Find 5 of the following. 1- Find the Eutectic, Eutectoid temperature of cast iron with 4.3% C 2- The microstructure of Cast iron with 3.5% C. 3- Find the melting point and microstructure of steel with 0.83% C 4- Define the temperature range for Acm temperature. 5- Find the AC3, Ac¡ temperature of steel with 0.45% C 6- The Liquid and Austinite percent with chemical composition for cast iron with 2.3% C at 1300°C
- Below is shown the isothermal transformation diagram for a 0.45 wt% C iron-carbon alloy. List the microconstituent(s) present for the heat treatment labeled (a)-(c) on this diagram. It is not necessary to state the proportion(s) of the microconstituents. I would love an explaiation aswel on how i whould read this diagram. ThanksFor a 64 wt% Zn-36 wt% Cu alloy, make schematic sketches of the microstructure that would be observed for conditions of very slow cooling at the following temperatures: 900°C (1650 F), 820°C (1510 F), 750°C (1380°F), and 600°C (1100 F). Label all phases and indicate their approximate compositions.Question 2: For the given Fe-C phase duagram (a) Compute the mass fractions of a ferrite and cementite in pearlite. (b) Compute the mass fraction of eutectoid ferrite in an iron-carbon alloy that contains 0.43 wt% C. (c) The mass fractions of total ferrite and total cementite in an iron-carbon alloy are 0.88 and 0.12, respectively. Is this a hypoeutectoid or hypereutectoid alloy? Why? Temperature (°C) 1600 1400 1200 1000 800 600 400 1538°C (Fe) 912°C M+R -1493°C 1394°C 7. Austenite 0.76 0.022 a, Ferrite y+L 2 2.14 Composition (at% C) 15 10 1147°C a + FezC L 3 Composition (wt% C) 4.30 Y+Fe3C 727°C 20 Cementite (Fe3C). 25 2500 2000 1500 1000 6.70 Temperature (°F)
- (11.10) Suppose that a steel of eutectoid composi- tion is cooled to 550°C (1020°F) from 760°C(1400°F) in less than 0.5 s and held at this temperature. (a) How long will it take for the austenite- to pearlite reaction to go to 50% comple- ton? To 100% completion? (b) Estimate the hardness of the alloy that has completely transformed to pearlite? 11.12) Briefly cite the differences between pearl- rp. bainite, and spheroidite relative to crostructure and mechanical properties?Use the following TTT Diagram for the following questions: 800 A 1400 -Eutectoid temperature 700 1200 600 1000 500 800 400 600 300 Mistart) 200 50% 400 M+A M(50%) M(90%) 100 200 10-1 10 102 103 10 105 Time (s) Temperature ("C) Termperature (°F)Problem Isothermal transformation diagram for an iron-carbon alloy of eutectoid com- position (0.76 wt% C). Assume that the specimen begins at 760°C and that it has been held at this temperature long enough to have achieved a complete and homogeneous austenitic structure. Sketch the following treatment on the figure: Rapidly cool to 575°C, hold for 20s, rapidly cool to 350°C, hold for 100s, then quench to room temperature. Specify microcon- tituents with percentage. 1. Sketch the following treatment on the figure: rapidly cool to 600°C, hold 4s, rapidly cool to 450°C, hold for 108, and rapidly cool to room temperature. Specify microcontituents with percentage. 3. ( Sketch the following treatment on the figure: rapidly cool to 450°C, hold 10s, rapidly cool to room temperature, heat to 680°C, hold 30hrs, and cool to room temperature. Specify microcontituents with percentage. Temperature (°C) 4. (a) 0.2 wt% C with spheroidite (b) 0.2 wt% C with fine pearlite 800 (c) 0.76 wt% C with fine…