Aerospace
RAS Alloy supplies nickel and cobalt superalloys to the aerospace industry for turbine engines, structural components and high-temperature fasteners. Materials are delivered with full AMS traceability, ultrasonic inspection and grain size control.
Typical Alloy Grades
718 / Waspaloy / A-286 / X-750 / Nimonic 90
Turbine discs, rings and blades
Inconel 718, Waspaloy, Nimonic 90
Combustion chamber and afterburner components
Hastelloy X, Nimonic 75
High-temperature fasteners and bolts
A-286, Inconel X-750
Engine casing and structural rings
Inconel 718, Inconel 625
Compressor shafts and spacer rings
Nimonic 901, Inconel 718
Applicable Standards
Turbine Disc Creep Failure — Root Cause Analysis
An aircraft engine MRO facility observed premature creep cracking in IN718 turbine discs after 12,000 cycles at 650°C.
Metallographic examination revealed undissolved delta-phase (Ni3Nb) at grain boundaries, indicating the solution treatment temperature was below the delta solvus. The material met AMS 5662 chemistry but the forging house deviated from the prescribed 980°C solution anneal.
Switched to RAS Alloy IN718 forgings with solution treatment at 980-1010°C verified by ASTM E112 grain size 5-8 and delta-phase dissolution check. Creep rupture life improved by 3.5× at 650°C/690 MPa.