What is heat treatment in metallurgy?
Heating metals or alloys in solid state and cooling them suitably to get desired properties.
Which parameters mainly affect heat treatment?
Temperature, holding time, and heating and cooling rates.
What does full annealing involve in steel treatment?
Heating steel to the proper temperature and slow cooling through the transformation range.
What microstructure does annealed hypereutectoid steel contain?
Coarse lamellar pearlite surrounded by a brittle proeutectoid cementite network.
Heat treatment purpose
Relieve stresses, refine grains, improve properties
Full annealing cooling
Cool slowly in furnace or insulating medium
Hypoeutectoid transformation
Austenite forms from pearlite, then transforms to fine ferrite and pearlite
Annealing temperature
About 50°F above A3 for hypoeutectoid steel
Spheroidising annealing
Forms spheroidal carbides in ferrite for machinability
Stress relief annealing
Heats below A1, reduces residual stresses
Recrystallisation annealing
Softens cold-worked steel by forming new grains
Answer 11 questions on Heat Treatment of Steel.
1. What combination of operations defines heat treatment for metals and alloys?
2. Which set contains the principal parameters that control the outcome of a heat treatment?
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