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Effect of Fe and C contents on the microstructure and high-temperature mechanical properties of IN625 alloy processed by laser powder bed fusion

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Kreitcberg, Alena et Brailovski, Vladimir. 2022. « Effect of Fe and C contents on the microstructure and high-temperature mechanical properties of IN625 alloy processed by laser powder bed fusion ». Materials, vol. 15, nº 19.

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Abstract

Two alloys with different Fe and C contents were studied to assess the influence of their compositions on the microstructure and mechanical properties of Ni-based Inconel 625 superalloy processed by laser powder bed fusion and subjected to stress relief annealing (870 °C) and a solution treatment (1120 °C). It was concluded that the alloy with a higher Fe content (~4 wt.% as compared to ~1 wt.%) manifests a greater propensity to segregate Nb and Mo elements during printing and form δ phase particles during the stress relief annealing. On the other hand, the alloy with a higher C content (~0.04 wt.% compared to ~0.02 wt.%) exhibits a greater tendency to form M6C carbides during the solution treatment. No effects of the Fe and C content variations on the room temperature mechanical properties were observed. On the contrary, an increase in the C content resulted in a 40% lower high-temperature (760 °C) ductility of the laser powder bed fused and post-processed IN625 alloy, without affecting its strength characteristics.

Item Type: Peer reviewed article published in a journal
Professor:
Professor
Brailovski, Vladimir
Affiliation: Génie mécanique
Date Deposited: 02 Nov 2022 19:13
Last Modified: 15 Nov 2022 14:14
URI: https://espace2.etsmtl.ca/id/eprint/25705

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