2022 №01 (07) DOI of Article
2022 №01 (09)

The Paton Welding Journal 2022 #01
The Paton Welding Journal, 2022, #1, 41-47 pages

Influence of long-term soaking on the structure and properties of IN625 alloy samples made by selective laser melting

N.O. Lysenko, O.O. Pedash, V.V. Klochykhin, P.O. Kasai

JSC “MOTOR SICH”, 69068, Zaporizhzhya, Ukraine

The paper presents the results of studying the influence of long-term soaking on the structure and properties of samples made by selective laser melting of Inconel 625 alloy powders, produced by the method of off-center plasma spraying of a rapidly rotating rod billet (PREP-process). Investigations of chemical composition, macro- and microstructure, mechanical and heat-resistant properties of the samples plotted in xy and z direction was performed. Samples after building and hot isostatic pressing with subsequent heat treatment by different variants were to be examined. Investigation results showed that performance of the operation of hot isostatic pressing of the samples with subsequent standard heat treatment promotes practically complete elimination of microporosity in inner volumes of the metal and obtaining a more uniform solid solution. It was established that long-term soaking at the temperature of 900 °C, facilitates lowering of ductile and heat-resistant properties of Inconel 625 alloy due to lamellar precipitates of δ-phase. Performed study was the basis for recommending the recovery heat treatment mode. In addition, it is shown that long-term soaking at the temperatures of 700 and 980 °С does not lead to precipitation of lamellar δ-phase.
Keywords: heat-resistant alloy; additive technologies; selective laser melting; hot isostatic pressing; heat treatment

Received: 27.10.2021
Accepted: 07.02.2022


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