Relevance of Dynamic Strain Aging under Quasi-Static Tension on AISI 304 Stainless Steel

AUTOR(ES)

Monteiro, Sergio Neves, Pereira, Artur Camposo, Braga, Fábio de Oliveira, Lima, Eduardo de Sousa, Ferreira, Carlos Luis

FONTE

Mat. Res.

DATA DE PUBLICAÇÃO

16/10/2017

RESUMO

The interval of existence of dynamic strain aging (DSA) in AISI type 304 austenitic stainless steel subjected to quasi-static tension tests, under strain rates from 3.5 x 10-2 to 3.5 x 10-4 s-1, in the temperature range from 25 to 800ºC was investigated. It was found that DSA occurs in the range extending from around 200 to 700ºC. Plastic instabilities associated with serrations, Portevin-Chatelier effect, allowed activation energies to be calculated and a possible mechanism of dislocation interaction with interstitial carbon atoms to be proposed. Significant increase in the ultimate strength, uniform elongation and work hardening demonstrate that DSA is a relevant phenomenon, which improves the high temperature mechanical properties of 304 steel.

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