____ is a heat-treating process used to return metals to their original pre-hardened condition.
A) Carburizing
B) Nitriding
C) Quenching
D) Annealing

Question

Quizplus · Accepted Answer

Annealing is a heat-treating process that involves heating metal above its recrystallization temperature and then slowly cooling it to room temperature to return it to its original pre-hardened condition. This process helps relieve stress and improve ductility and toughness in the metal. Carburizing and nitriding are processes used to introduce carbon and nitrogen, respectively, into the surface of a metal to increase its hardness and wear resistance. Quenching involves rapidly cooling a metal to increase its hardness but can also cause brittleness and stress within the material.

____ Is a Heat-Treating Process Used to Return Metals to Their