Surface-finish effects on the high-cycle fatigue of Alloy 718

Technical Report · Mon Jun 01 00:00:00 EDT 1981

DOI:https://doi.org/10.2172/706556· OSTI ID:706556

Korth, G E

Load control high-cycle fatigue tests at 427 and 649{sup 0}C were conducted on Alloy 718 specimens given various surface finishes. The standard surface preparation for fatigue specimens is a low-stress grind that minimizes the residual surface stresses. A low-stress grind surface was used for generating baseline data; other surfaces that could be considered feasible for large components fabricated in commercial shops were produced on test specimens, and the high-cycle fatigue strength of each was compared. Surface finishes produced by belt sanding, grit blasting, fine machining, and electropolishing were examined. Surface roughness measurements were taken on typical specimens with each surface finish, and residual stress profiles were measured on three of the surface types. Results show little or no difference in fatigue life for the various surfaces; rather they indicate that residual stress profile and grain size are more important factors than surface roughness in determining high-cycle fatigue strength.

• Research Organization: EG and G Idaho, Inc., Idaho Falls, ID (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC07-76ID01570
• OSTI ID: 706556
• Report Number(s): EGG-2105
• Resource Relation: Other Information: PBD: Jun 1981
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
INCONEL 718
FATIGUE
SURFACE FINISHING
GRINDING
ROUGHNESS
RESIDUAL STRESSES
GRAIN SIZE
LMFBR TYPE REACTORS
REACTOR MATERIALS
SCANNING ELECTRON MICROSCOPY
ALLOY-NI53CR19FE19NB5MO3
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
BREEDER REACTORS
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
ELECTRON MICROSCOPY
EPITHERMAL REACTORS
FAST REACTORS
FBR TYPE REACTORS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCONEL ALLOYS
IRON ALLOYS
LIQUID METAL COOLED REACTORS
MATERIALS
MECHANICAL PROPERTIES
MICROSCOPY
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM A
REACTORS
SURFACE PROPERTIES