EMAT - HEAT TREATMENT

Heat treatment process where the metal (usual steel) is heated above the critical temperature range then suddenly cooled in water or oil.

• Hardening

• Annealing

• Normalizing

• tempereing

Heat treatment process where the metal (usual steel) is heated and then allowed to cool slowly in ambient air in order to eliminate internal stress in the metal

• Hardening

• Quanching

• Normalizing

• tempering

Which of the following heat treatments aims to significantly increase the hardness of steel (but unfortunately making it more brittle)?

• normalizing

• hardening

• tempering

• annealing

Which of the following heat treatment process is usually performed after the hardening?

• tempering

• quenching

• annealing

• normalizing

Which of the following steel crystal structure is the softest and most ductile

• ferritic

• pearlitic

• austenitic

• martensitic

Which of the following mechanical properties is achieved by quenching?

• improved hardness

• improved softness

• improved toughness

• improved ductility

The annealing and tempering processes are the same in such a way that metals are heated and then allowed to cool slowly. They differ though in one aspect which is ____________

• annealing is heated above the critical temperature while tempering is heated below the critical temperature

• annealing is cooled in the air while tempering is cooled in water

• annealing takes uses carbon-rich gas atmosphere

• tempering uses nitrogen-rich gas atmosphere

Which is the proper sequence for the heat treatment process of steel?

• annealing - hardening - tempering

• hardening - annealing - tempering

• tempering -annealing - hardening

• hardening - tempering - annealing

Case hardening process in which a metal part or component of low carbon content is heated in a carbon-rich gas atmosphere

• Carburization

• Nitriding

• Carbonizing

• annealing

Which of the following heat treatment process is used to relieve or eliminate the internal stress in the metal caused by subsequent machining and forging.?

• normalizing

• annealing

• hardening

• quenching