ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 11

Strain Fatigue and Tensile Behavior of Inconel® 718 from Room Temperature to 650°C

Brinkman, CR
research engineer, Oak Ridge National Laboratory, Oak Ridge, Tenn.

Korth, GE
Associate scientist, Aerojet Nuclear Co., Idaho Falls, Idaho

Abstract

Results of tensile and fully reversed strain-controlled fatigue tests, conducted on three heats of Incone® 718 that had been subjected to different solution annealing and aging treatments, are presented. Tests were conducted at temperatures ranging from 22 to 650°C, with fatigue tests defining behavior over the cyclic range from 10² to 10⁶ cycles to failure. Average best fit equations defining true stress-strain, strain-controlled fatigue, and cyclic stress-strain behavior are given for the two heat treatments characterized. Heat-to-heat variations in the elevated temperature tensile and fatigue behavior were found. Fatigue lifetime was seen to be dependent upon grain size, particularly at lower strain ranges.

Keywords:
Inconel®, fatigue (materials), tensile properties, mechanical properties

Paper ID: JTE10109J
DOI: 10.1520/JTE10109J
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