Homework Answers
The order of least ductile to most ductile will be
Martensite
Tempered martensite
Bainite
Fine pearlite
Coarse pearlite
Spheroidite
- Martensite is the most hard and brittle among the given microstructures with fine grain stucture. Hence it has least ductility.
- Tempered martensite is used to increase the toughness by increasing the ductility of martensite.
- Bainite have finer structure making it less ductile than pearlite. But the structure is more coarse as compared to tempered martensite.
- Fine pearlite is less ductile because of more restricted plastic deformation.
- Coarse pearlite is more ductile than fine pearlite.
- Spheroidite is most ductile because of least carbon content. Also it has the least strength.
Coarse structures have more spacing in between which allows dislocation to go more easily. Hence generally, coarse structure have high ductility as compared to fine stuctures.
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