Question
Download Solution PDFThe metastable aggregate consisting of supersaturated ferrite in which carbon has been finely precipitated in the form of carbides is
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Bainite:
- Very fine microstructure of ferrite and carbides (Fe3C)
- Properties are like ferrite but with different structures.
- Stronger and more ductile than particles at the same hardness level.
Martensite:
- Hardest, brittle, and least ductile constituent of steel.
- Needle-like structure.
- Solid solution of non-carbide in α - iron.
- It has a body-central tetragonal structure.
Ferrite:
- There are two forms of ferrite i.e., α - ferrite and δ - ferrite
- α - ferrite, is a solid solution of body-centered cubic iron.
- It has a maximum solid solubility of 0.022% C at a temperature of 727°C.
- δ - ferrite is another form that is stable only at very high temperatures and is of no practical significance in engineering.
- Ferrite is relatively soft and ductile
Cementite:
- Cementite, which is 100% iron carbide (Fe3C), has a carbon content of 6.67%.
- It is also called carbide.
- It is a very hard and brittle intermetallic compound and has a significant influence on the properties of steel.
Last updated on May 28, 2025
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