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8. The mass fraction of eutectoid cementite in an iron-carbon alloy is 0.109. on the basis...
The microstructure of an iron-carbon alloy consists of proeutectoid cementite and pearlite; the mass fractions of these microconstituents are 0.12 and 0.88, respectively. Determine the concentration of carbon in this alloy. The iron-iron carbide phase diagram is shown in the Animated Figure 9.24. wt%C Composition = 0 wt% C Composition = 0 at% C Temperature = 400 °C Temperature = 752 F 2025 Composition (at% C) 10 15 160025 1600 97538 9493 °C 1400 1400 2500 | 1394 °C y+L...
2. The mass fractions of ferrite and cementite in an iron-carbon alloy are 0.88 and 0.12, respectively, at 7270C. Note that the solubility of carbon in ferrite is 0.026 wt% at 7270C. Using the Fe-C phase diagram in Part A, determine whether this alloy is hypoeutectoid or hypereutectoid.
6. The microstructure of an iron-carbon alloy consists are of an iron-carbon alloy consists of procutectoid cementite and pearlite, the mass fraction of these microconstituents are 0.17 and of these microconstituents are 0.17 and 0.83, respectively. Determine, a) the concentration of carbon on this alloy and by the phase limit compositions (15 pts) 7+ Fec Temperature + Fec 6.70 0.022 0.76 V+X) (Pearlite); Ci Wrc = V/(V+X) (proeutectoid cementite)
...cementite and pearlite; the mass fraction these
microconstituents are 0.17 and 0.83, respectively. Determine. a)
the concentration of carbon on this alloy and b) is this alloy
hypereutectoid?
* Question Completion Status: Question 13 The microstructure of an iron-carbon alloy consists of proeutectoid cementite and pearlite; alloy hypoeutectoid or hypereutectoid? 1600 10 15 25 150C 14936 1400 13940 2500 1200 1147 Austenie 2.14 4.30 1 Temperature 2000 1000 9126 Tempenture () y. Feyc 300 727°C 1500 0.76 0.022 Femte 600...
8. For an alloy with 1.25 wt% Cat temperature just below eutectoid, determine the following: a. The fractions of total ferrite and cementite phases b. The fractions of pro-eutectoid cementite and pearlite C. The fraction of eutectoid cementite 9. For an eutectoid steel, sketch and label a time-temperature path that will produce the following: a. 50% Pearlite & 50% Bainite b. 100% Martensite C. 100% Coarse Pearlite
3. What is the proeutectoid phase for an iron-carbon alloy in which the mass fractions of total ferrite and total cementite are 0.89 and 0.11, respectively? Why?
What is the proeutectoid phase for an iron-carbon alloy in which the mass fractions of total ferrite and total cementite are 0.96 and 0.04, respectively? See Animated Figure 9.24 Part 1 What are the concentrations of carbon in a-ferrite and FeyCat a temperature just below 727°C? You may want to use Animated Figure 9.24 (a) C = i (b) Cre,c = i Save for Later Attempts:0 of 1 used Submit Answer Part 2 Compute the composition of an iron-carbon alloy...
1. Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition, specify the nature of the final microstructure (in terms of microconstituents present and approximate percentages of each) of a small specimen that has been subjected to the following time-temperature treatments. In each case 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 (a) Rapidly cool to 400°C, hold for...
Problem 3 (20 pts): Using the phase diagram and isothermal transformation diagram for an iron- carbon alloy of eutectoid composition. Assuming 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, answer the following questions: 1400 Eutectoid temerabre 1000 800 400 600 300 400 200 MC90%) 100 200 Time (s) We were unable to transcribe this image
Problem 3 (20 pts): Using the phase...
(10 Question 3: points: 5 pts each) a) What are ferrite and cementite in the Iron - Carbon system? Explain in detail. b) What are the eutectic and eutectoid points and reactions? Explain and give example reaction for each one.