The TTT diagram for a 1077 eutectoid steel is given. Explain the heat treatment process to form 50% Fine Pearlite + 50% Coarse Bainite. 800 A 1400 Eutectoid temperature 700 A 1200 P 600 1000 500 800 400 300 600 M(start) 200 50% 400 M + A M(50%) M(90%) 100 200 10-1 1 10 102 103 104 105 Temperature (°C) - x -o Temperature (°F)

For an alloy containing 20 wt % Ag, refer to the Cu-Ag phase diagram given in the Figure: What is the melting point of Cu in °C? What are the relative amounts(in %) of the existing phases at 900°C? Define the Eutectic point in terms of °C and the composition % of Ag.

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Using the isothermal transformation diagram given in Figure 2 for a specific material composition to answer the following (this is NOT an Fe-C steel!). NOTE: Assume that you begin with a single-phase sample of α at 790 C.a. What temperature on the diagram corresponds to the α-to-γ phase transformation temperature that would be found on an equilibrium phase diagram? Explain your answer. b. What temperature would provide the most rapid, isothermal phase transformation of α to γ? What would be the minimum time from onset of the phase transformation to its completion? c. On Figure 2, draw and label a cooling schedule (from 790 C) that will produce a single-phase α material at 100 C. How does the thickness of the piece of material influence your ability to create a single-phase α structure? d. Why does the time to initiate phase transformation become smaller as the temperature is reduced within the temperature range above the “nose” of the TTT diagram? Be specific, what process is…

the PCS containing 0.4%C was quenched hardened in water, amd tempered at 400oC. sketch and identify the phases of the microstructure pf the stell at rhe following states a) above the upper critical point just before quenching in water b) after quenching I’m water prior to tempering C) after tempering

This is the microstructure of astm a 128 a high magnesease steel. This microstructure was taken after etching the samples. After etching why did it turn the microstructure colors. What can be determined when looking at the microstructure of this sample

Composition lat% N 40 60 100 1600 2800 1500 1453 C 2600 Liquid 1400 Solidus line Liquidua line 2400 1300 1200 2200 1100 1085 C 2000 1000 20 40 100 Composition (wt N (NO What is the amount for each phase in 1kg of a 50% Ni-50% Cu alloy at temperatures of 1400, 1300, or 1200 degrees C for point A and point B? Temperature ('C) Temperature ("F)

Bainite phase and pearlite phase have different mechanical properties due to its structure differences. Discuss the hardness and tensile strength of these 2 phases using isothermal transformation temperature diagram.

Determine the tensile strength, yield strength and percentage elongation (% ductility) for an iron- carbon alloy with 0.76 wt % carbon composition. O Yield strength - 60000 psi : Tensile strength - 110000 psi: Ductility - 15% O Yield strength - 130000 psi : Tensile strength - 68000 psi;: Ductility - 10% O Yield strength - 68000 psi : Tensile strength - 130000 psi; Ductility - 10% O Yield strength 50000 psi: Tensile strength - 100000 psi: Ductility - 20% O Yield strength - 86000 psi : Tensile strength 150000 psi: Ductility 25%

T or F -In the hypereutectoid steel alloy, the primary phase is Cementite ( iron carbide )   -In the Pb-Sn hypoeutectic alloy, the primary phase is the α-phase  -The eutectic composition of the solder alloy is 98%wt Sn -In the steel alloys, the weight percent of the alloying elements affects the eutectoid temperature and Ceutectoid wt%C -Austenite phase has a BCC crystal structure The microstructure is characterized by: a.The number of phases present b.The present phases’ proportions. c.How these phases are arranged or distributed d.all of the answers