Published June 1981 | Version v1
Report Restricted

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

Creators

Description

Alloy 718 us a precipitation-hardening nickel-base superalloy that is being specified for various components for liquid-meal fast breeder reactors (LMFBRs). This alloy maintains high strength at elevated temperatures making it a desirable structural material. But the property that justifies most LMFBR applications is the alloy's resistance to thermal striping damage due to its high fatigue endurance strength. Thermal striping is a high-cycle fatigue phenomenon caused by thermal stresses from the fluctuating mixing action of sodium streams of differing temperatures impinging on the metal surfaces. Most of the design data is generated from laboratory fatigue specimens with carefully controlled surface finishes prepared with a low-stress grind and buffed to a surface finish 8--12 in. Since Alloy 718 has been shown to be quite notch sensitive under cyclic loading, the detrimental effect on the high-cycle fatigue properties caused by shop surface finishes of actual components has been questioned. This report examines some of the surface finishes that could be produced in a commercial shop on an actual component

Availability note (English)

MF available from INIS under the Report Number; OSTI as DE91015595; NTIS; INIS; US Govt. Printing Office Dep.

Files

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Additional details

Publishing Information

Imprint Pagination
21 p.
Report number
EGG--2105

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
22088449
Subject category
S36: MATERIALS SCIENCE; S36: MATERIALS SCIENCE; S21: SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS;
Descriptors DEI
ALLOY-NI53CR19FE19NB5MO3; FATIGUE; LMFBR TYPE REACTORS; REACTOR MATERIALS; ROUGHNESS; SCANNING ELECTRON MICROSCOPY; SURFACE FINISHING
Descriptors DEC
ALLOYS; ALUMINIUM ADDITIONS; BREEDER REACTORS; CHROMIUM ALLOYS; CORROSION RESISTANT ALLOYS; ELECTRON MICROSCOPY; EPITHERMAL REACTORS; FAST REACTORS; FBR TYPE REACTORS; HEAT RESISTING ALLOYS; INCONEL ALLOYS; IRON ALLOYS; LIQUID METAL COOLED REACTORS; MATERIALS; MECHANICAL PROPERTIES; MICROSCOPY; MOLYBDENUM ALLOYS; NICKEL ALLOYS; NICKEL BASE ALLOYS; NIOBIUM ALLOYS; REACTORS; SURFACE PROPERTIES; TITANIUM ADDITIONS

Optional Information

Contract/Grant/Project number
Contract AC07-76ID01570
Funding organization
USDOE, Washington, DC (USA).