Experimental investigation of delta phase precipitation in inconel 625 superalloy aged at 550, 625 and 725 °C

Tipo
Artigo
Data de publicação
2020
Periódico
Materials Research
Citações (Scopus)
7
Autores
Baldan R.
da Silva A.A.A.P.
Tanno T.M.
da Costa E.T.
Brentegani J.V.N.
Couto A.A.
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Resumo
© 2020 Universidade Federal de Sao Carlos. All rights reserved.The δ is an important stable phase that replaces the metastable γ'' in the microstructure of Inconel 625 superalloy. The present work aims to investigate the kinetic of δ-phase precipitation in the microstructure of Inconel 625 nickel-based superalloy aged at 550, 625 and 725 °C up to 1000 h. Aging temperatures were chosen based on the thermodynamic simulation using JMatPro software which indicated that this phase is stable at temperatures below 905 °C. Microstructure of the heat-treated samples was analyzed via SEM/EDS and microhardness evolution was performed by Vickers microhardness tests. The results have shown that the samples aged at 550 °C (all times), 625 °C (all times) and 725 °C up to 200 h did not presented microstructural evidences of δ precipitation. However, samples aged at 725 °C for 500 and 1000 h clearly presented an acicular δ-phase precipitated mainly at the grain boundaries. It was noted changes in the microhardness at different aging time and temperatures probably due to the presence of γ'' and/or δ phases. The sample aged at 625 °C for 1000 h presented the highest microhardness value (333 ± 10 HV).
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Aging temperatures , Aging time and temperatures , Experimental investigations , Inconel 625 superalloys , Microhardness evolutions , Nickel- based superalloys , Thermodynamic simulations , Vickers microhardness tests
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