AME Unit 2 Heat treatments, Annealing Normalising Flashcards

AME Unit 2 Heat treatments, Annealing Normalising

Question: With reference to tempering as a heat treatment of steel, explain the changes in mechanical properties and the internal structure.

C. Increased toughness, decreased brittleness, and refinement of microstructure.

Question: With reference to the heat treatment of steel, which steels are best suited for annealing?

B. Low-carbon steels

Question: With reference to case hardening steel components, describe a simple onboard process.

B. Flame hardening.

Question: With reference to case hardening steel components, describe solid pack carburizing.

C. A process where the workpiece is heated in a carbon-rich environment to introduce carbon into the surface layer.

Question: With reference to the case hardening of bearing journals, describe the nitriding process.

C. A chemical process where nitrogen is diffused into the surface of the workpiece to form a hard compound layer.  

Question: Explain how the properties of steel are modified by its carbon content.

C. Increasing carbon content increases strength but decreases ductility.

Question: With reference to the case hardening of bearing journals, explain why this process may be carried out.

C. To increase the wear resistance of the journal surface.

Question: With reference to the case hardening of steel components, describe the changes that occur with this process.

B. Increased hardness at the surface, while maintaining a tough core.

Question: With reference to aluminum, state the effect work hardening has on its properties.

B. Increases strength, decreases ductility.

Question: With reference to aluminum, describe how it could be annealed on board a vessel.

B. By heating the aluminum to a specific temperature, holding it there, and then cooling it slowly.

Question: Describe the heat treatment process a used copper washer would undergo, stating the reasons for the processes.

A. Annealing to relieve stresses and improve ductility.

Question: Explain normalizing.

C. Normalizing is a heat treatment process that refines the grain structure and improves toughness.

Question: Describe the heat treatment process a valve spring would undergo, stating the reasons for the processes.

A. Annealing to improve ductility, followed by hardening to increase strength.

Question: Explain hardening.

B. Hardening is a heat treatment process to increase hardness and reduce ductility.

Question: With reference to aluminum, explain what is meant by work hardening.

C. The increase in strength of aluminum due to plastic deformation.

Question: With reference to the hardening of steel as a heat treatment process, what changes occur in the mechanical properties and internal structure?

B. Increased hardness, decreased ductility, and formation of martensite.

Question: Describe the heat treatment process a crankshaft would undergo, stating the reasons for the processes.

C. Hardening to increase wear resistance, followed by tempering to improve toughness.

Question: With reference to aluminum, describe the internal changes when it becomes work hardened.

B. Grain size decreases and elongated grains form, leading to increased strength.

Question: Explain annealing.

B. Annealing is a heat treatment process that softens the metal and increases ductility.

Question: With reference to the case hardening of bearing journals, describe the induction hardening process.

B. A heat treatment process where only the surface of the workpiece is rapidly heated using high-frequency currents, followed by quenching.

Question: With reference to the case hardening of steel components, explain why it may be required.

C. To enhance the wear resistance of the component's surface.  
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