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1 Please describe the microstructural changes in the three stage of recovery, recrystallization and
grain growth during annealing process.
Answer
Annealing- is a heat treatment process that alters the physical and at times the chemical
properties of a material thus increasing its ductility and inversely reducing its hardness. The three
stages of the annealing process, proceeding with increasing temperature are; recovery stage,
recrystallization stageand grain growth.
Recovery-This is the first stage. It occurs at lower temperatures of all the other two processes. It
involves removal of linear defects, dislocations, and the internal stresses. The grain size and
shape do not change.
Recrystallization- This is the second stage. At this stage the grains that were deformed are
replaced by distinct new defect free grains that nucleate and grow, forming a new microstructure.
It involves short range diffusion. It is time dependent, the longer the time the higher the
recrystallization.
Grain growth- This is the third stage. After recrystallization the strain free grains will continue to
grow in grain size in the material at elevated temperature. The microstructure therefore
coarsens.As the grains increase in size, total boundary area reduces, yielding a decrease in the
t...
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