Question
Asked Mar 11, 2020
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Briefly discuss four heat treatment methods to enhance the properties of steel.What are the advantages of each treatment?

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Expert Answer

Step 1

Heat treatment is a technique of altering the physical and mechanical properties of metal without changing the chemical properties of the metal.

 

Following are the four heat treatment methods:

 

1) Hardening:

In the method of hardening of steel, the steel is heated above its critical transforming temperature and is then rapidly cooled through the quenching process to increase the hardness of the steel. The advantage of the method of hardening is that this process introduces carbon that hardens the outer layer of steel and leaves the core soft and ductile and this improves the wear resistance of steel.

Step 2

2) Annealing:

In the method of annealing, the steel is heated to a specific temperature and is then cooled down slowly to room temperature to refine the microstructure of the steel. Annealing reduces the hardness of the steel and increases the ductility and toughness of steel. The advantage of the method of annealing is that it softens the steel which allows the steel to endure large value of strain without strain during the cold forming process.

 

Step 3

3) Tempering:

Tempering is the method of reducing the stresses built up in the steel and reduces the brittleness caused by the hardening of steel. In the method of tempering, hardened steel is heated to increase the toughness and reduce the brittleness of the steel. The advantage of the tempering method is that it allows reducing the brittleness of the steel and incr...

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