what is hardening and queaching of steel ? explain
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Hardening =>
Hardening may be define as the heat treatment of steel or other metals which increases it's hardness by rapid cooling from austenite face.
Purpose of hardening =>
1.To increase the hardness of the parts
2.To make the steel able to cut other metals (as a cutting tool).
3.To make the parts wear resistant.
4.To develop best combination of strength and notch ductility.
Process=>
1. Heat the steel above 30 to 50°C above the upper critical temp. In case of hypoeutectoid steel and 30 to 50°C above the lower critical temperature from hypoeutectoid steel.
2.Holding it at that temp. For sufficient time (from 15 to 30 minutes per 25mm thickness) to allow it to attain austenite structure (FCC)
3.cool it rapidly by quenching in a suitable medium (water, oil etc)
This is ur ans hope it will help you in case of any doubt and more information u can comment below
Hardening may be define as the heat treatment of steel or other metals which increases it's hardness by rapid cooling from austenite face.
Purpose of hardening =>
1.To increase the hardness of the parts
2.To make the steel able to cut other metals (as a cutting tool).
3.To make the parts wear resistant.
4.To develop best combination of strength and notch ductility.
Process=>
1. Heat the steel above 30 to 50°C above the upper critical temp. In case of hypoeutectoid steel and 30 to 50°C above the lower critical temperature from hypoeutectoid steel.
2.Holding it at that temp. For sufficient time (from 15 to 30 minutes per 25mm thickness) to allow it to attain austenite structure (FCC)
3.cool it rapidly by quenching in a suitable medium (water, oil etc)
This is ur ans hope it will help you in case of any doubt and more information u can comment below
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