Modification of properties for specific purposes (AQA GCSE Design and Technology): Flashcards
📚Flashcards
Practise the cards
13 cards from this deck
ShowHide
Practise the cards
13 cards from this deck
Critical temp. for hardening carbon steel
Critical temp. for hardening carbon steel
900°C
Quenching in heat treatment
Quenching in heat treatment
Rapid cooling in water
Trade-off when hardening steel
Trade-off when hardening steel
Harder but more brittle
Purpose of tempering
Purpose of tempering
Reduce brittleness while maintaining hardness
Tempering temp. for drills & punches (max hardness)
Tempering temp. for drills & punches (max hardness)
232-238°C
Tempering temp. for spanners (more flexibility)
Tempering temp. for spanners (more flexibility)
316°C
Purpose of annealing
Purpose of annealing
Makes metals softer and more workable
Critical aspect of cooling in annealing
Critical aspect of cooling in annealing
Must cool slowly in air
Annealing colour for copper
Annealing colour for copper
Cherry red
Temperature indicator for annealing aluminium
Temperature indicator for annealing aluminium
Soap solution turns black
Purpose of case hardening
Purpose of case hardening
Hard surface with tough, flexible core
Temperature for case hardening
Temperature for case hardening
950°C (cherry red)
What case hardening increases on surface
What case hardening increases on surface
Carbon content