Engineering Subjects; Material Science and Engineering:
AMIE Exam Lectures- Materials Science & Engineering | Heat Treatment | Tempering & its Type | 10.6
Previous Video - : Different types of heat treatment processes
Present Video - : Tempering
Tempering - :
It is required just after the hardening process and is heated below lower critical temperature followed by air cooling or furnace cooling.
Changes takes place during tempering - :
- Carbon rejected by BCT martensite.
- Formation of ferrite and carbide mixture.
Austempering Process - : Austempering is converted to martensite
- Low internal stess
- Less distrotion
- Improves mechanical property.
Sub - Zero Treatment
- Used to reduce retained austensile.
Results in - :
- Increased hardness
- Increased wea resistance
- Increase in internal stress , tempering required.
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