Modification of properties for specific purposes (AQA GCSE Design and Technology): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What is the critical temperature for hardening carbon steel?
What is the critical temperature for hardening carbon steel?
900°C
What is quenching in the hardening process?
What is quenching in the hardening process?
Rapid cooling by plunging into water
What is the main purpose of tempering hardened steel?
What is the main purpose of tempering hardened steel?
To reduce brittleness while keeping hardness
What temperature range is used for tempering tools needing maximum hardness?
What temperature range is used for tempering tools needing maximum hardness?
232-238°C
What is the purpose of annealing metals?
What is the purpose of annealing metals?
To make them softer and more workable
What cooling method is critical for successful annealing?
What cooling method is critical for successful annealing?
Cooling very slowly in air
What colour does copper turn when it reaches its annealing temperature?
What colour does copper turn when it reaches its annealing temperature?
Cherry red
What is the main benefit of case hardening a component?
What is the main benefit of case hardening a component?
Hard surface with tough, flexible core
What temperature is steel heated to for case hardening?
What temperature is steel heated to for case hardening?
950°C
What happens to steel's brittleness during the hardening process?
What happens to steel's brittleness during the hardening process?
It increases
Why is emery cloth used before tempering?
Why is emery cloth used before tempering?
To see oxide colour changes clearly
Which components are ideal for case hardening?
Which components are ideal for case hardening?
Bearings, gears, and cam surfaces