Homework
ch9:
Due date:12/29
11,19,35,43,50,51,65
Additional problems are below:
1.Asuuming that, at 323K, water can dissolve phenol up to 20wt%
while the phenol can dissolve water up to 30wt%. A mixed liquid
consists of 70wt% water and 30wt% phenol is poured into a glass beaker
and two layers are formed.
(a)Draw the H2O-C6H5OH phase diagram around 323K
(b)What is the weight percentage of the water-rich layer at 323K?
d(phenol)=1.07g/cm^3
2.A Fe-1.0wt%C was furnace cooled to room temperature.
(a)What is the amount of pearlite?
(b)What is the total amount of cementite?
(c)Draw a sketch showing the microstructure of this steel at room temperature
3.In order to braze Si chips with some metal such as Mo, some Si semiconductor
are coated(sputtered) with a thin Al-Si alloy layer.
(a)Find an Al-Si phase diagram
(b)What is the Si content in the Al-Si alloy will you choose, why?
ch10:
Due date:12/29
6,15,18,20,28,34,D1
Addtional problems are below:
1.Using the isothermal transformation diagram(TTT) for a 4340 steel,
determine the final microstructure (in terms of the phases present and
their approximate percentages) when a 4340 specimen is subjected to the
following time-temperature treatment:
Rapidly cool from austenite 650 Celsius degrees, hold for 1000 seconds,
rapidly cool to 400 Celsius degrees, hold for 10000 seconds,
then quench to room temperature.
ch11
Due date:2010/01/05
4,8,11,D1
Please remember to hand in your homework on time.
BTW, old tests are also available on the website of the department.
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※ 編輯: alan0311 來自: 218.161.123.90 (12/22 20:20)
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