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Tricky Materials Science
In which of the following processes does recovery, recrystallization, grain growth take place?
a) Surface hardening
When a material is plastically deformed at low temperature(arounddegrees) relative to the melting temperature, which of the following change isn’t observed?
a) Change in grain shape
b) Strain hardening
c) Decrease in dislocation density
d) Increase in dislocation density
At which of the following temperature can recovery occur? (where Tm is melting point)
Strain-relief crystallization takes place when deformed metals are heated.
Which of the following statements are false in strain-relief crystallization?
a) Dislocation climb
b) Decrease in the electric resistance
c) Increase in density
d) Interaction of like signed dislocation
By what percentage can the hardness decrease after strain-relief crystallization?
In which of the following metal polygonization rarely takes place?
Which of the following processes can be used to refine the grain structure?
c) Grain growth
d) Such a process does not exist.
Lowest temperature for recrystallization for iron is 270°C
Which of the following is false for grain growth?
a) The grains start growing
b) Grain growth accelerates with increase in temperature
c) Decrease in free energy
d) Increase of surface energy
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