Question
Download Solution PDF____ is a cooling medium applied for normalizing process.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
- Heat treatment is an operation involving heating and cooling of a metal or alloy so as to obtain certain desirable properties.
- A few important heat treatment processes are:
- Annealing
- Normalizing
- Hardening
- Tempering
Normalizing:
- Heat the steel from 30°C to 50°C above its upper critical temp, held about fifteen minutes, and then allowed to cool down in still air.
- The homogeneous structure provides a higher yield point, ultimate tensile strength and impact strength with lower ductility to steels.
- Main objective:
- The mechanical properties of steels are better than those produced by annealing.
- Residual stresses are relieved only partly
- Fine grains are formed
- Strength and hardness is more
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