The influence of cold, warm and hot deformation on microstructure and mechanical properties of Inconel 718 superalloy
J. Min. Metall. Sect. B-Metall., 61 (3) (2025) 303-315. DOI:10.2298/JMMB250729024D
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Available online 25 novembar 2025
(Received 29 July 2025; Accepted 17 November 2025)
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This study systematically examines the influence of precipitation on the microstructural and mechanical properties of Inconel 718 superalloy in as-received, solution heat-treated, peak-aged, and overaged conditions. Cold, warm, and hot deformation tests were performed at 25 °C, 400 °C and 800 °C using a constant strain rate of 5.55 × 10⁻⁴ s⁻¹. The results indicated dynamic strain aging during warm deformation at 400 °C in all investigated conditions. However, at temperatures above 400 °C, a pronounced reduction in strength was observed, accompanied by a corresponding increase in elongation for most conditions. Notably, the solution heat-treated samples exhibited anomalous behavior, showing an increase in Rp0.2 after deformation at 800 °C. This suggests the occurrence of dynamic precipitation during hot deformation in the solution heat-treated samples.
Keywords: Superalloys; Dynamic strain aging; Microstructure; Mechanical properties
Correspondence Address:
Tugay Doğan,
Karabük University, Technology Faculty, Karabük, Türkiye;
email: sgunduz@karabuk.edu.tr
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