What is the crystal structure of martensite? Why can you not find a martensite phase region in the Fe-Fe3C phase diagram? What is the distinct feature of martensitic transformation?
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What is the crystal structure of martensite? Why can you not find a martensite phase region in the Fe-Fe3C phase diagram? What is the distinct feature of martensitic transformation?
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- Use the Lead-Tin (Pb-Sn) phase diagram below to answer the following questions: Place the following microstructures in the correct order of formation for slowly cooling a 98 wt% Sn alloy from 300 °C to room temperature (point A to point B).What is a peritectic phase diagram? Draw a typical equilibrium diagram for a eutectic type of system with limited solid solubility and explain its important features.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.
- Specify all temperature-composition points at which eutectics, eutectoids and peritectics. At 700 degrees Celsius and composition of 20% by weight of copper, calculate the compositions by fraction of each phase for copper?Consider 1.0 kg of austenite containing 1.15 wt% C, cooled to below 727 °C (1341 °F). (a) What is the proeutectoid phase? (b) How many kilograms each of total ferrite and cementite form? (c) How many kilograms each of pearlite and the proeutectoid phase form? (d) Schematically sketch and label the resulting microstructure. Temperature (°C) 1600 1400 1200 1000 800 600 1538°C 400 0 -1493°C 1394°C 912°C y, Austenite 0.76 0.022 a, Ferrite 5 Y+L 2.14 Composition (at% C) 15 10 1147°C a + Fe3C L 4.30 y + Fe3C 727°C 20 Cementite (Fe3C) 5 6 4 (Fe) Composition (wt% C) Adapted from Binary Alloy Phase Diagrams, Vol. 1, 2nd edition, T. B. Massalski (Editor-in-Chief), 1990. Reprinted by permission of ASM International, Materials Park, OH. 25 2500 2000 1500 -1000 6.70 Temperature (°F)Consider the binary eutectic copper-silver phase diagram shown below. Make phase analysis of a 80 wt % Ag–20 wt% Cu alloy at the temperatures (a) 900°C, and (b) 780°C-ΔT. In the phase analysis include: (I) phases present, (ii) chemical compositions of phases, (iii) mass fractions of phases, and (iv) sketch of microstructure.
- What are the effects of alloving elements on Fe-C binary phase diagramRefer to Figure 1 showing the phase diagram for the Fe-Fe3C system. Consider 1.0 kg of austenite containing 1.15 wt% C, cooled to below 727 C (1341 F). What is the proeutectoid phase? How many kilograms each of total ferrite and cementite form? How many kilograms each of pearlite and the proeutectoid phase form? Schematically sketch and label the resulting microstructure.Copper-Nickel alloy is widely applied in industry. (a) List at least three applications where Cu-Ni alloy is used; (b) How many components and phases are shown in the below phase diagram? (c) For a mixture of 40 wt% Cu and 60 wt% Ni at 1320 oC, what phases are present? Identify theamount of these phases by applying “lever rule”.
- What is the maximum amount of Pb (in %) with which Sn may be alloyed to render a single β phase at 183°C. Looking at the Binary Phase Diagramb) Figure 2 is the tin-gold phase diagram, for which only single-phase regions are labeled. Specify temperature-composition points at which all eutectics, eutectoids, peritectics, and congruent phase transformations occur. Also, label the non-label regions (A,B.C,D,E,F.G,H). 1000 800 L - 600 400 D 200 B 20 40 60 80 100 (Au) (Sn) Composition (wt% Au) Figure 2 Tin-gold phase diagram Temperature (*C)Which line on the above phase diagram corresponds to the Solid-Liquid transition? Answer