Fatigue-crack growth in Inconel 718 weldments at elevated temperatures
The techniques of linear-elastic fracture mechanics were used to characterize the fatigue-crack growth behavior of Inconel 718 gas tungsten arc (GTA) weldments over the temperature range 24 to 649 C (75 to 1200 F). Two different postweld heat treatments were employed: the conventional (ASTM A637) treatment, and a modified heat treatment designed to eliminate the brittle Laves phase that forms during the welding process. Weldment specimens given the modified postweld heat treatment consistently exhibited superior fatigue-crack growth behavior relative to conventionally-treated weldments. In addition, weldment specimens treated by either process exhibited higher crack growth rates than plate specimens similarly heat treated.
- Research Organization:
- Westinghouse Hanford Co., Richland, WA
- OSTI ID:
- 6406528
- Journal Information:
- Weld. J. Res. Suppl.; (United States), Journal Name: Weld. J. Res. Suppl.; (United States)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
22 GENERAL STUDIES OF NUCLEAR REACTORS
INCONEL 718
CRACKS
WELDED JOINTS
CHEMICAL COMPOSITION
CORROSION RESISTANCE
FRACTURE PROPERTIES
HEAT TREATMENTS
MECHANICAL PROPERTIES
REACTOR COMPONENTS
REACTOR MATERIALS
TEMPERATURE DEPENDENCE
ALLOYS
CHROMIUM ALLOYS
INCONEL ALLOYS
JOINTS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
360103* - Metals & Alloys- Mechanical Properties
220200 - Nuclear Reactor Technology- Components & Accessories