Sunday, December 1, 2019

Normalising


The normalising process is a simple one that follows the basics of process annealing (used for stress-relieving of welded structures and large castings) but the cooling process occurs in still air rather than in the furnace.The component to be normalised is heated at temperatures around 40°C above the critical temperature for the particular metal alloy and soaked for several hours. Cooling in still air avoids large grain size occurring due to atomic diffusion. The resultant fine grain structure is stress free and the mechanical properties generally show a decrease in overall hardness, altered ductility and increased overall toughness, i.e. impact strength.Cold rolling and casting are forming processes that produce grain structures that may require normalising before the component is put into service.

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