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A high-cycle fatigue program was performed drld consisted of testing the following conditions: (1) nonmicrofissured, (2) microfissured, (3) microfissured with subsequent electron beam cosmetic pass, and (4) microfissured with subsequent gas--tungsten-arc weld overlay. The nonmicrofissured condition resulted in an endurance strength of 120 ksi at lo7 cycles. Scanning electron microscope examination of the fractured surfaces revealed initiation sites dt carbides. This provided a baseline for comparing subsequent testing. Specimens containing microfissures showed an endurance limit of 60 ksi at lo7 cycles. Scanning electron microscope examination of the fractured surfaces confirmed that initiation was at the site of a microfissure. Both the electron beam cosmetic pass and the gas-tungsten-arc weld overlay over existing microfissures improved fatigue strength. However, the electron beam cosmetic pass resulted in a substantial increase, while the yds-tungsten-arc weld overlay specimens resulted in only a modest increase. tndurance strengths at lo7 cycles were 97 ksi and 74 ksi, respectively. Scanning electron microscope examination of these specimens showed much smaller microfissures when compared to the microfissure specimens. Superalloy 718-Metallurgy and Applications Edited by E.A. Loria The Minerals. Metals & Materials Society, 1989

High-Cycle Fatigue Effects of an Electron-Beam Cosmetic Pass or a Gas-Tungsten-Arc Weld Overlay on Microfissured Alloy 718