Nondestructive Determination of Fracture Toughness of Alloy 718 Welded Structures
Haggag, F.M., "Nondestructive Determination of Fracture Toughness of Alloy 718 Welded Structures Using Novel Stress-Strain Microprobe® Technology," Final Report No. DOE/ER/82316-1, Award No. DE-FG02-97ER82316, Advanced Technology Corporation, 1998.
This DOE SBIR report extends ABI® fracture toughness determination to Alloy 718 (Inconel 718) welded structures — a high-temperature nickel superalloy used in aerospace gas turbine engines, nuclear reactor internals, and other demanding high-temperature applications.
Alloy 718 is one of the most widely used nickel superalloys, valued for its combination of high strength, corrosion resistance, and weldability at temperatures up to 650°C. However, its welded structures can exhibit reduced fracture toughness in the heat-affected zone, making weld integrity assessment critical for safety.
Demonstrating fracture toughness determination on welded Alloy 718 structures established ABI®'s capability for high-temperature nickel superalloy characterization — directly relevant to both DOE advanced reactor programs and commercial aerospace applications where Alloy 718 is extensively used.