.17 Determine the relative amounts (in terms of mass fractions) of the phases for the alloys and temperatures given

Construct the hy pothetical phase diagram for metal A and B between temperature of 600 C° and 1000 C° given the following information: The melting point of A is 940 Cº. The solubility of B in A is negligible at all temperatures The melting point of metal B is 830 Cº. The maximum solubility of A in B is 12%A, which occurs at 700 Co. At 600 C°, the solubility of A in B is 8%A. One eutectic occurs at 700 C° and 75%B. A second eutectic occurs at 730 C° and 60%B. A third eutectic occurs at 755 C° and 40%B. One congruent melting point occurs at 780 C° and 51%B. A second congruent melting point occurs at 755 C° and 67%B. There exist two intermetallic compounds: AB at 51%B and AB2 at 67%B. Note all composition are in weight percent.

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3. The figure below shows the phase diagram for a hypoeutectoid plain carbon steel. Assume that point c is slightly above 723 °C and point d is slightly below 723 °C. i. ii. iii. Explain the structure at points a, b, c, and d on the diagram. Determine the wt% of proeutectoid ferrite at point c. Determine the wt% of eutectoid ferrite at point d. Temperature (°C) 1000 900 800 700 600 500 400 0 100% Fe y+ a 0.02 a + Fe, C b 0.4 723°C y + Fe, C Pearlite 0.8 Weight percent carbon Fe₂C 6.67

When alloys A, B, and C are gently cooled from 1000 o C in the following temperature ranges, sketch their microstructures. (equilibrium cooling). List every phase present in the microstructures. Comment on the constituent phases of the resulting alloy and its mechanical characteristics. Please keep it brief.

Using the Tin_Lead phase diagram, at 40% tin at 200C, what is the composition of the liquid phase? and how much of hte material is in that phsae?

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11.15) Make a copy of the isothermal transforma- tion diagram for an iron-carbon alloy of eutectoid composition (Figure 11.14) and then sketch and label on this diagram time- temperature paths to produce the following microstructures: (a) 100% coarse pearlite. (b) 100% tempered martensite. (c) 50% coarse pearlite, 25% bainite, and pearl- 25% martensite.

For a 1095 steel alloy, what would the percent of each phase be at 730°C and 725°C?

Using the lead-tin phase diagram in Figure 6.3, determine the liquid and solid phase compositions for a nominal composition of 30% Sn and 70% Pb at 250°C (482°F).