Answer
The microstructures of pearlite, bainite, and spheroidite all consist of α-ferrite and cementite phases.
For pearlite, the two phases exist as layers which alternate with one another.
Bainite consists of very fine and parallel needle-shaped particles of cementite that are surrounded by an α-ferrite matrix.
For spheroidite, the matrix is ferrite, and the cementite phase is in the shape of sphere-shaped particles. Bainite is harder and stronger than pearlite, which, in turn, is harder and stronger than spheroidite.
Work Step by Step
The microstructures of pearlite, bainite, and spheroidite all consist of α-ferrite and cementite phases.
For pearlite, the two phases exist as layers which alternate with one another.
Bainite consists of very fine and parallel needle-shaped particles of cementite that are surrounded by an α-ferrite matrix.
For spheroidite, the matrix is ferrite, and the cementite phase is in the shape of sphere-shaped particles. Bainite is harder and stronger than pearlite, which, in turn, is harder and stronger than spheroidite.
