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Work Hardening | Annealing | Heat Treatment
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Work hardening
• When metal is bent or shaped by hitting with a mallet, the area being reshaped becomes harder and more brittle.
It is possible to get rid of the brittle areas by annealing the metal.
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Annealing• the process of heating metal to soften it and
remove the brittleness. This softens the metal which means it can be cut and shaped more easily
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Annealing aluminium
https://www.youtube.com/watch?v=FxhdFsrzSmY&feature=player_embedded
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Hardening and Tempering • High Carbon Steel is the only common metal
that can be hardened by heat treatment.
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Hardening and Tempering
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Case Hardening
• Mild steel cannot be hardened and tempered because it does not contain enough carbon for the process to work.
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Case Hardening
• Case hardened mild steel is very tough, because any cracks that start in the hard, brittle outer case are stopped by the soft core.
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Questions
• Explain how repeat bending of mild steel wire will result in it breaking in two
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Questions
• What is meant by the term ‘annealing’?
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Questions
• How would you anneal aluminium
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Questions
• How would you anneal mild steel?
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Questions
• How can high carbon steel be hardened by heat?
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Questions
• Why does hardened steel need to be tempered?
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Questions
• How is mild steel treated so that it can be hardened?
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Questions
Why is case hardened mild steel tough?