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 at a predetermined rate, usually very slowly, within the furnace.
2) A carbon steel piece is heated just above 730 Degree Centigrade, maintained at that temperature for a few hours and then slowly cooled. What heat treatment process is carried out ?
Related Heat Treatment MCQ - Machinist(Set-1) with Answers
It was suddenly cooled in brine
It was suddenly cooled in brine in heat treatment, this is the main reason for the component to crack after heat treatment.
Low-carbon steel parts
Case-hardening or surface hardening is the process of hardening the surface of a metal object while allowing the metal deeper underneath to remain soft, thus forming a thin layer of harder metal (called the "case") at the surface.
Normally Low carbon steel parts are subjected to case hardening process.