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Observations on dynamic strain aging manifestation in inconel 718 superalloy

par Rezende, Mônica Costa;Araújo, Luana L.S.;Gabriel, Sinara S.B.;Dille, Jean ;de Almeida, Luiz Henrique
Référence Materials science forum, 930 MSF, page (390-394)
Publication Publié, 2018

Article révisé par les pairs

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Résumé :

The manifestation of dynamic strain aging (DSA) in Inconel 718 is reported in this work. Analysis were performed in the material with different microstructures resulting from solution anneal and aging treatment. Tensile tests were made under secondary vacuum with temperature ranging between 200 and 950°C and strain rates of 3.2 x 10-3 to 3.2 x 10-5 s-1. Results showed the range of DSA occurrence. Analysis indicates that at lower temperatures, from approximately 200 to 450°C, serrations are controlled by the diffusion of carbon. At higher temperatures, until 800°C, DSA coincided with the occurrence of other thermally activated phenomena: dynamic precipitation, especially γ’’, and Oxidation Assisted Intergranular Cracking (OAIC). It was observed that competitive phenomena affect DSA manifestation directly due to the availability of niobium in solid solution.