Sketch the Time-Temperature Transformation (TTT) diagram for eutectoid steel. On the same diagram, sketch and label the cooling curves to yield the following microstructures: (i) 100% coarse pearlite. (ii) 50% fine pearlite and 50% martensite. (iii) 100% upper bainite. (iv) 50% lower bainite and 50% martensite. (v) 100% martensite.
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(i) 100% coarse pearlite (ii) 50% fine pearlite and 50% martensite (iii) 100% upper bainite (iv) 50% lower bainite and 50% martensite Show more…
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Match the time-temperature cooling paths for a 1080 steel on a TTT diagram that will produce the following microstructures: (1) 100 percent martensite, (2) 50 percent martensite and 50 percent pearlite, (3) 100 percent fine pearlite, (4) 50 percent martensite and 50 percent bainite, and (5) 100 percent lower bainite. 1. Cooling curve (a) 2. Cooling curve (b) 3. Cooling curve (c) 4. Cooling curve (d) 5. Cooling curve (e) 6. Cooling curve (f) 7. Cooling curve (g) 100 percent lower bainite 50 percent martensite and 50 percent bainite 50 percent martensite and 50 percent pearlite 100 percent martensite 100 percent fine pearlite
Adi S.
Consider the following isothermal transformation diagram for a eutectoid Fe-C alloy. Explain how you would select the time-temperature path to produce a 50% bainite / 50% Martensite, starting from the austenite phase at 800°C
2. Draw schematic diagrams to show how growth rate and nucleation rate should vary with temperature for diffusional transformations that are induced by an increase in temperature. 3. Explain the microstructure evolution in path 2 and 3 in the following TTT diagram 900 Austenite Highest temperature at which ferrite can form 1100 800 1 Eutectoid temperature 1000 700 2 Pearlite transformation starts Pearlite transformation ends 900 600 Bainite transformation ends 500 400 3 Ms M50 300 M90 800 700 600 500 200 Bainite Ferrite and pearlite Ferrite and martensite 10 100 103 104 105 Time, in seconds 400 100 .5 1 106 FIG. 18.39 Arbitrary time-temperature paths on the isothermal diagram of a hypoeutectoid steel
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