Interrupted quenching

 The quenching i.e., rapid cooling mechanism discussed in Section 2.4 has it own disadvantages.

HEAT TREATMENT PROCESSES Contd...

INTERRUPTED QUENCHING

✔ The quenching i.e., rapid cooling mechanism discussed in Section 2.4 has it own disadvantages. Some of the disadvantages of continuous rapid cooling are:

1. Setting up severe quenching stresses, 

2. Warping or distorting the object, and

3. Promoting crack formation in the steel.

These undesirable effects may develop during uneven cooling of the heat-treated material.

✔ In order to overcome the disadvantages of continuous quench- ing, a modified quenching procedure known as interrupted quenching is usually used.

✔ Two forms of interrupted quenching are:

1. Martempering, and

2. Austempering.