The influence of cold, warm and hot deformation on microstructure and mechanical properties of inconel 718 superalloy

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 ]> <![CDATA[ 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 Rp_0.2 after deformation at 800?C. This suggests the occurrence of dynamic precipitation during hot deformation in the solution heat-treated samples.