Surface Hardening Quiz

What is the primary aim of surface hardening, also known as case hardening?

• To decrease the weight of metal components

• To increase the electrical conductivity of metal components

• To increase the hardness and wear resistance of the surface layer of a metal component

• To enhance the magnetic properties of metal components

Why is surface hardening particularly useful for components like gears, bearings, and shafts?

• Because it enhances their optical properties

• Because it increases their resistance to high temperatures

• Because it increases their resistance to high wear and abrasion

• Because it reduces their manufacturing costs

What is the primary purpose of the nitriding process in metal treatment?

• To decrease the metal's melting point

• To increase surface hardness and wear resistance

• To enhance the metal's electrical conductivity

• To reduce the weight of the metal component

During the nitriding process, what gas is used to treat the metal component?

• Oxygen

• Hydrogen

• Nitrogen

• Carbon dioxide

What compounds are formed on the metal surface during the nitriding process?

• Iron oxide and iron sulfide

• Iron nitride (Fe3N) and iron carbonitride (Fe4N)

• Iron phosphate and iron chloride

• Iron carbide and iron silicide

What is the primary method used in induction hardening to heat the metal component?

• Convection heating

• Electromagnetic induction

• Direct flame application

• Infrared radiation

What is the purpose of quenching in the induction hardening process?

• To heat the metal further

• To clean the metal surface

• To achieve rapid cooling

• To paint the metal surface

Why is induction hardening particularly useful for components with complex geometries?

• It is less expensive than other methods

• It allows for localized hardening requirements

• It changes the color of the metal

• It decreases the durability of the metal

What is the primary purpose of annealing as a heat treatment process?

• To increase the electrical conductivity of metal

• To soften metal, relieve internal stresses, and improve its machinability, ductility, and toughness

• To harden the metal surface for better wear resistance

• To enhance the magnetic properties of metal

During the annealing process, what is done to the metal?

• The metal is rapidly heated and quenched in water

• The metal is melted completely and then recast

• The metal is heated to a specific temperature and held there before slowly cooling

• The metal is exposed to a chemical solvent to alter its properties