🔍 Key Concepts
• Heat treatment processes such as annealing, normalizing, quenching, and tempering
• How heat treatment changes mechanical properties of steel (strength, hardness, ductility)
• The relationship between heat treatment and internal stresses and workability (machining)
💭 Think About
• Think about what happens to steel when it is heated and cooled in a controlled way. Which properties can be changed by this process?
• Consider whether heat treatment is usually done for just one single purpose or if it can serve multiple benefits at the same time.
• Ask yourself: in shipbuilding and repair, why might engineers decide to heat treat a steel component after forming, welding, or machining it?
✅ Before You Answer
• Verify which properties of steel are commonly improved by annealing and tempering (e.g., ductility, toughness).
• Check whether residual stresses from welding or forming can be reduced through heat treatment.
• Confirm if changing the steel’s structure through heat treatment can make it easier to machine (cut, drill, or shape).