Can someone solve this for me URGENT!!! 9.39 For a 30 wt% Zn-70 wt% Cu alloy, make schematic sketches of the microstructure thatwould be observed for conditions of very slow cooling at the following temperatures: 1100 C(2010°F), 950°C (1740°F), 900°C (1650°F), and 700°C (1290°F). Label all phases and indicatetheir approximate compositions.

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Answered: 9.39 For a 30 wt% Zn-70 wt% Cu alloy,…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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9.43 For a 76 wt% Pb-24 wt% Mg alloy, make sche- ● matic sketches of the microstructure that would be observed for conditions of very slow cooling at the following temperatures: 575°C (1070°F), 500°C (930°F), 450°C (840°F), and 300°C (570°F). Label all phases and indicate their approximate compositions.
A steel alloy is known to contain 93.8 wt% Fe, 6.0 wt% Ni, and 0.2 wt% C. Assume that there are no alterations in the positions of other phase boundaries with the addition of Ni. (a) What is the approximate eutectoid temperature of this alloy? i °C (b) What is the proeutectoid phase when this alloy is cooled to a temperature just below the eutectoid? (c) Compute the relative amounts of the proeutectoid phase and pearlite. Wa Wp : i
BI (a) Figure BI below shows the equilibrium phase diagram of hypothetical A - B alloy system. Answer the following questions. What are technical names of Line A and Line B? What do they signify? (i) (ii) With the aid sketches, portray the microstructures and phases that are present for the 20wt%A-80wt%B alloy (Alloy A) at the temperatures of 780 °C, 670 °C, 652 °C, and 500 °C, respectively. (iii) Assume an A - B alloy (Alloy B) has 60wt%a - 40wt%L, in terms of weight, at a temperature of 652 °C. Determine the overall composition of Alloy B. (o) emai 700 8 600 500 400 800 0 A 760 °C Line B W a /9.5 20 Line A a + L 650 °C 40 Liquid (L) wt%B Figure B1 52.5 a + ß 60 B+L 80 93.7 B 100 B
Q1 / Two metals Beryllium (Be) and Silicon (Si) have melting points 1282°C and 1414 °C respectively, are completely soluble as liquids but completely insoluble as solids . They form a eutectic at 1090°C containing 61 wt% Si -39wt% Be? Determine the following:- 1- Draw the thermal equilibrium phase diagram and identify all phases are present in diagram ,then sketches what happens in microstructure when the alloys containing , a- 10wt% Si, b-70wt%Si , solidify completely. 2- Determine the composition and the amount of each phase for the alloy which contain 15 wt% Si-85wt% Be at 1150°C If the alloy is hypoeutectic determine the amount of eutectic at 600 °C? or hypereutectic and
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
Q3 (a) Three plain-carbon steel types are: eutectoid, hypoeutectoid, and hypereutectoid can be seen in the Iron-Carbon phase diagram as shown in Figure Q3(a). Explain the effect of heating to 780 °C and slow cooling to 650 °C on these material types for the carbon weight percentages of 0.4%, 0.8% and 1.2%.. (i) (ii) Draw the effect of temperature on the microstructure of one plain carbon steel tvpe. (1539* C) 2902 F 2554 F Liquid L+ Austenite L+Cementite Austenite 2065 "F (1130 C) Eutectic (Ledeburite) Aus, + Ferrite Austenite + Cementite (908* C) 1666* F 1333 F (723 C) K. Eutectoid (pearlite) Ferrite Ferrite + Cementite 0.8 2.0 4.3 6.67 Fe,C Percent carbon by weight Hypo- eutectoid Hyper- eutectoid Hypoeutectio - Hypereutectic Steels Castirons Figure Q3(a) Temperature, F
For a 70-30 Zn-Cu alloy, what would the percent of each phase be at 800°C and 500°C?
For 40 wt% Sn – 60 wt% Pb alloy at 150 oC (at point B) as shown in Figure, i. State the name of phase(s) present. ii. Calculate the composition(s) of the phase(s) present. 600 300 Liquid 500 a+L 200 400 300 100 200 100 20 60 100 (Pb) (Sn) Composition (wt % Sn) Temperature ("C) Temperature ("F)
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.
According to the following graph, two samples of 1080 steel are cooled from the eutectoid temperature, one at a cooling rate of 250°C/s and the other at a cooling rate of 7.27x10-8 °C/s. Specify the phases obtained and explain their formation from thermodynamic and kinetic perspectives. Also, briefly describe their formation. Draw the microstructure of the phases obtained. Sıcaklık (C) 800 700 600 500 400 300 200 100 0 10 1 T M(başlama) M(% 50) M(% 90) 10 M+O -Otektoid Sıcaklık 10² Zaman (s) % 50 10³ 104 105
4. The figure below shows the phase diagram for a hypereutectoid plain carbon steel. Assume that point c is slightly above 723 °C and point d is slightly below 723 °C. i. Explain the structure at points a, b, c, and d on the diagram. ii. Determine the wt% of proeutectoid cementite at point c. iii. Determine the wt% of eutectoid cementite at point d. Temperature (°C) 1100 900 700 500 300 100 a + Y R 0 100% Fe 0.02 1.0 Fe, C 1.2 2.0 Fe,C Fe, C Pearlite 3.0 4.0 Weight percent carbon y+ Fe, C 723°C a + Fe, C 1 5.0 Fe,C 1 6.0 6.7
A hypo-eutectoid steel with composition of 0.5% carbon is heated to 1000°. Using the a iron-carbon phase diagram (also found in the course book, or here https://commons.wikimedia.org/wiki/File:Iron_carbon_phase_diagram.svg (Links to an external site.) (Links to an external site.)) answer the following questions. (a) What phase or phases will be present at 950°C? (b) If temperature is lowered from 950°C, at which temperature (estimate) α phase (Ferrite) will appear? (c) Use the lever rule to estimate how much (wt%) ferrite and how much austenite will exist just above 727 °C? (d) What happens to the austenite if the temperature is lowered below 727 °C? (e) Schematically sketch and label the resulting microstructure.

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