What is the purpose of heat treatment?

• To increase the strength of materials

• To improve the ductility of materials

• To modify the microstructure of materials

• All of the above

Which of the following is not a common heat treatment process?

• Annealing

• Quenching

• Brazing

• Tempering

What is the purpose of annealing?

• To increase hardness

• To relieve internal stresses

• To improve machinability

• To increase toughness

Martensite is a microstructure that forms during which heat treatment process?

• Annealing

• Normalizing

• Quenching

• Tempering

What is the purpose of quenching?

• To increase hardness

• To reduce brittleness

• To improve ductility

• To decrease strength

Tempering is done after quenching to:

• Increase hardness

• Decrease toughness

• Increase ductility and toughness

• Decrease strength

Which heat treatment process involves heating the material to a temperature below the transformation range, holding it at that temperature, and then cooling it in still air?

• Annealing

• Normalizing

• Quenching

• Tempering

Which of the following is a disadvantage of rapid cooling (quenching)?

• Increased hardness

• Reduced distortion

• Increased risk of cracking

• Improved machinability

Which heat treatment process involves heating the material to a temperature above the transformation range, holding it at that temperature, and then cooling it in a controlled environment such as a furnace?

• Annealing

• Normalizing

• Quenching

• Tempering

What is the purpose of tempering?

• To increase hardness

• To reduce strength

• To increase ductility and toughness

• To decrease machinability