Question

Describe the detail the process for obtaining a very large grain size in a metal by deformation and annealing .

Answer 1

It has long been known that the properties of some metals could be changed by heat treating. Grains in metals tend to grow larger as the metal is heated. A grain can grow larger by atoms migrating from another grain that may eventually disappear. Dislocations cannot cross grain boundaries easily, so the size of grains determines how easily the dislocations can move. As expected, metals with small grains are stronger but they are less ductile

Process where material is heated to above the recrystallization temperature of the sample and then cooled down.•Main purpose is to improve Cold work properties by increasing ductility and retaining most of the hardness. •There are 3 steps involved with annealing: recovery, recrystallizationand grain growth.