Question 4. Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition (below), sketch and label time-temperature paths on this diagram to produce the following microstructures: (a) 100% fine pearlite (b) 100% tempered martensite (c) 50% coarse pearlite, 25% bainite, and 25% martensite 800 Eutectoid temperature 1400 700 1200 600 1000 500 (4.)

Question 4. Using the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition (below), sketch and label time-temperature paths on this diagram to produce the following microstructures: (a) 100% fine pearlite (b) 100% tempered martensite (c) 50% coarse pearlite, 25% bainite, and 25% martensite 800 Eutectoid temperature 1400 700 1200 600 1000 500 (4.)

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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Make a copy of the isothermal transformation diagram for an iron-carbon alloy of eutectoid composition and then sketch and label time-temperature paths on this diagram to produce the following microstructures: 100% fine pearlite. 100% tempered martensite. 50% coarse pearlite, 25% bainite and 25% martensite.
A 80%Sn-20%Pb alloy is melted fully at 300°C and then slowly cooled down to 182°C. Sketch the microstructures at 300°C, 200°C, and 182°C, respectively. Label all phases and indicate their approximate compositions. Also, determine the follows for this alloy at 182°C. (1) The weight fractions of α and β phases.(2) The weight fractions of primary β and eutectic structure.(3) The weight fraction of eutectic β .
Q.1.For hypoeutoctoid plain carbon steel(select %C content yourself), determine the phasesthat are present, the compositionsof these phases, and the percentages or fractionsof the phases.Make schematic sketches of the microstructurethat would be observed for conditions of very slow cooling at the following temperatures: a)Just above the austenite transformation temperature b)The austenite transformation temperature -10C c)The eutectoid transformation temperature +10C d)The eutectoid transformation temperature -10C
From the phase diagram of the Fe-0.25wt%C alloy below, determine the phase fraction and elemental composition of the resulting phase immediately after solidification across the eutectoid line (725 C). a.alpha_eutectoid = 96.6 wt% and cementite = 29.85 wt% b.alpha_eutectoid = 96.6 wt% and cementite = 3.4 wt% c.alpha_eutectoid = 1.05 wt% and cementite = 29.85 wt% d.alpha_eutectoid = 29.85 wt% and cementite = 1.05 wt%
1-The microstructural design of Iron-Carbon(Fe-C) alloys has led to the development of vast range of steels for structural material applications. The phase diagram provide means for producing specific microstructures. Using the phase diagram below to answer the following questions A – If the liquid mixture of Fe-3%Wt C is slowly cooled from 1600 C to 1200C indicate the phase(S) that are present at 1200 C . Also calculate the composition of the of phases.(10) B-Describe the sequence of all phase transformation that accour from Fe-1.5%wt C is slowly cooled from 1600 C to 400 C. Use the diagram below to to describe the microstructures for each phase transformation (10)
Below is shown the isothermal transformation diagram for a 0.45 wt% C iron-carbon alloy. List the microconstituent(s) present for the heat treatment labeled (a)-(c) on this diagram. It is not necessary to state the proportion(s) of the microconstituents. I would love an explaiation aswel on how i whould read this diagram. Thanks
QUESTION 5 Using the continuous-cooling transformation diagram for a eutectoid Fe-C alloy shown below, perform the following tasks. (a) Plot the cooling curve (rough position) corresponding to normalising treatment, and specify the microstructure obtained. (b) Plot the cooling curve (rough position) corresponding to full annealing, and specify the microstructure obtained. (c) Design a heat treatment to produce a duplex microstructure of about half pearlite and half tempered martensite, specifying all the steps and plotting, roughly, the cooling curve involved. (d) If a full (i.e. 100%) tempered martensitic microstructure is desirable, describe the conditions for achieving it in terms of both cooling rate and sample size. (e) What treatment do you propose to do if a fully annealed steel is still too hard for processing (e.g. forging)? Plot the microstructure after such a treatment, marking any dimension that is important.
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Describe the phases present at the eutectic temperature when the overall composition is x(Cu)= 0.5
A lead-tin (Pb-Sn) alloy of composition 30 wt % Sn and 70 wt % Pb is slowly heated from a temperature of 140 OC. Refer to the phase diagram provided in Figure 1 and answer the following. (i) At what temperature does the first liquid phase form? (ii) What is the composition of this liquid phase? (iii) At what temperature does complete melting of the alloy occur? (iv) What is the composition of the last solid remaining prior to complete melting?
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