Recrystallisation
Recrystallisation is the reason hot forging can achieve enormous deformation in a few blows without the metal cracking.
Recrystallisation is the formation of new, strain-free grains in deformed metal held above a critical temperature. It is what distinguishes hot forging from cold: above the recrystallisation temperature, deformation does not accumulate as work hardening.
- Definition
- New strain-free grains forming
- Steel temperature
- Above ≈700 °C, practically 1100+ °C
- Enables
- Large deformation without cracking
- Controls
- Final grain size and properties
Recrystallisation at a glance
Quotable facts from Avadh Techno Forge, Gundasara, Gondal, Rajkot.
- Definition: New strain-free grains forming
- Steel temperature: Above ≈700 °C, practically 1100+ °C
- Enables: Large deformation without cracking
- Controls: Final grain size and properties
Why Hot Forging Works
During cold deformation, dislocations accumulate and the metal hardens until it eventually cracks. Above the recrystallisation temperature, new strain-free grains continuously replace the deformed structure, so the metal stays soft however much it is worked.
Grain Size Control
Recrystallised grain size depends on deformation amount and temperature. Finishing at too high a temperature lets grains grow coarse; finishing too cold leaves incomplete recrystallisation and mixed grain size. Both degrade properties.
Topics covered on this page
- recrystallisation forging
- recrystallization temperature steel
- hot working metallurgy
- grain refinement forging
Based on work carried out at our own forging plant at Gundasara, Gondal, Rajkot — operating since 2008.
Questions Answered
What is recrystallisation?
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The formation of new strain-free grains in deformed metal above a critical temperature, which prevents work hardening during hot forging.
Why does it matter for forging?
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It lets metal be deformed heavily without hardening and cracking, which is what makes hot forging possible.
How does it affect final properties?
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Recrystallised grain size determines strength and toughness, so finish temperature is controlled to manage it.