Phase Equilibria and Phase Transformation Quiz

What is another name for the Isothermal Transformation Diagram?

• Alloy Steel Diagram

• Phase Diagram

• Time-Temperature-Transformation Diagram

• Microstructural Diagram

Which type of steel is the TTT diagram valid for?

• Austenitic steel

• Eutectoid steel

• Martensitic steel

• Ferritic steel

What microstructure is formed by slow cooling resulting in coarse pearlite with thick ferrite and cementite layers?

• Spheroidite

• Bainite

• Pearlite

• Martensite

What is the main characteristic of martensite in terms of hardness?

• Moderately hard

• Very soft

• Brittle

• Very hard

Which heat treatment process is used to relieve stresses, increase softness, ductility, and toughness in a material?

• Normalizing

• Tempering

• Annealing

• Quenching

What is the purpose of quenching in the heat treatment process?

• To soften and toughen the material

• To increase hardness and strength

• To produce rounded carbide forms

• To refine grains and produce uniform distribution

What is the main effect of tempering on martensite steel?

• Reduces hardness and strength

• Increases hardness and strength

• Reduces ductility and toughness

• Increases ductility and toughness

What is the primary purpose of spheroidizing in the heat treatment process?

• To increase hardness and strength

• To refine grains and produce uniform distribution

• To produce rounded carbide forms

• To produce martensite

What does the TTT diagram help in understanding for alloy steel?

• Microstructure of bainite

• Phase transformations during isothermal cooling

• Formation of martensite

• Properties of pearlite

What is the purpose of normalizing in the heat treatment process?

• To soften and toughen the material

• To increase hardness and strength

• To refine grains and produce uniform distribution

• To relieve stresses and improve machinability