Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 8.15, Problem 23AAP
Consider the binary eutectic copper–silver phase diagram in Figure P8.23. Make phase analyses of an 88 wt% Ag–12 wt% Cu alloy at the temperatures (a) 1000°C, (b) 800°C, (c) 780°C + ΔT, and (d) 780°C − ΔT. In the phase analyses, include:
- i. The phases present
- ii. The chemical compositions of the phases
- iii. The amounts of each phase
- iv. Sketch the microstructure by using 2-cm-diameter circular fields.
Figure P8.23
The copper–silver phase diagram.
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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)
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
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.
Chapter 8 Solutions
Foundations of Materials Science and Engineering
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