Investigation of Microstructure and Properties of Ultra-High Strength Steel in Aero-Engine Components following Heat Treatment and Deformation Processes

C250 steel, renowned for its remarkable strength and toughness, is extensively utilized in the aerospace industry manufacturing critical components. This research investigates microstructure properties of forgings produced through different heat treatment temperatures, aging durations, thermal cycling intervals. The results demonstrate that samples were compressed at 1050 °C followed by air-cooling using conventional maraging treatment. For cycle treatment, temperature was maintained cycled 1–2 times, with a preservation period 1 h subsequent water-cooling. Solution °C, 5 h, then air hardening performed to achieve best forging hardness. Interestingly, solution time under age conditions had no significant effect on grain size but hardness martensitic aged steel.