Heat Treatments (Leaving Cert Engineering): Flashcards

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Annealing
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Definition of annealing

Heat treatment process to soften materials, particularly steel

Purpose of annealing

Makes materials more workable for further manufacturing

Heating temp. in annealing

Approx. 23\frac{2}{3} of steel's melting temperature

Purpose of soaking step

Ensures even heat distribution throughout component

Cooling method in annealing

Turn off oven, leave component inside to cool extremely slowly

Key characteristic of annealing

Slow cooling rate

Recrystallisation in annealing

Formation of completely new grain structure within steel

Grain structure after annealing

Large, unstressed grain structure

Softness of annealed steel

Soft material that deforms easily

Ductility of annealed steel

Ductile, allows shaping without breaking

Main application of annealing

Prepares steel for cold working processes

Cold working processes after annealing

Bending, hammering, twisting, stretching

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