Abstract
The precipitation effects occurring in a commercial AISI Type 316 steel in the temperature range 600° to 850°C have been studied for times up to 900 hours by means of optical metallographic techniques. Carbide precipitation along grain boundaries precedes the formation of ferrite and sigma phase, and growth of the latter precipitates appears to depend on re-solution of the carbides. Sigma appears to form directly from the austenite and not from the ferrite formed at shorter times.
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