Inconel 718 HIP 소재의 고온 피로 거동 비교

Inconel 718 is commonly applicate for liquid-propellant rocket engine due to its higher strengths and good fatigue properties at elevated temperature. Powder metallurgy (P/M) and hot isostatic pressing (HIP) are applied for manufacturing superalloy parts because of hardship for fabricating and higher cost. In this study, the strengths, elongations and fatigue strengths of Inconel 718 fabricated by P/M and HIP were compared to Inconel 718 fabricated by cast and forging. The test results showed HIPed Inconel 718 had lower yield strength, elongation and fatigue life than forged material.