Journal Published Online: 01 January 1986
Volume 14, Issue 1

Estimation of Fatigue Life at Elevated Temperature of Electron Beam Weldments of Alloy 718



Axial displacement-controlled fatigue tests were conducted at 600°C on smooth solid cylindrical specimens of Alloy 718 with electron beam weldments. By monitoring the diametral strain response of the heat-softened region, relationships between strain amplitude and fatigue life, and between cyclic stress and strain, were obtained. Using the cyclic stress-strain curve of the soft region, the load-controlled fatigue test results corresponded to the axial displacement-controlled test results. Subsequently, a simple model of strain sharing in the weldment was established for cyclic loading in order to estimate the fatigue life. Using the model, the fatigue life of a welded specimen under axial loading was estimated as a function of gage length, considering the effect of gage length on strain concentration in the soft region.

Author Information

Fukakura, J
Heavy Apparatus Engineering Laboratory, Toshiba Corporation, Yokohama, Japan
Mori, T
Heavy Apparatus Engineering Laboratory, Toshiba Corporation, Yokohama, Japan
Pages: 6
Price: $25.00
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Stock #: JTE10313J
ISSN: 0090-3973
DOI: 10.1520/JTE10313J