Main objective of annealing process is to _______.

Question

Question

This question was previously asked in

ISRO SAC Technician B Fitter 21 Oct 2018 Official Paper

Answer 1

Explanation:

Annealing:

The annealing process is carried out by heating the steel above the critical range, soaking it for sufficient time to allow the necessary changes to occur, and cooling it at a predetermined rate, usually very slowly, within the furnace.
Annealing consists of heating hypo-eutectoid steels to 30 to 50°C above the upper critical temperature and 50°C above the lower critical temperature for hypereutectoid steels.
The main objective of the annealing process is to relieve internal stress and increase ductility and sometimes increase machinability.

Purpose:

To soften the steel.
To improve machinability.
To increase ductility.
To relieve internal stresses.
To refine the grain size and prepare the steel for the subsequent heat treatment process.