Abstract
The lowcycle fatigue tests of Inconel 625 nickelbased superalloy welding joints at 25 and 760 °C were performed . The strain-fatigue life data and cyclic stress-strain data were analyzed to determine the strain fatigue parameters of Inconel 625 superalloy welding joints. The result showed that the relationship between elastic strain amplitude, plastic strain amplitude and reversals to failure could be described by Basquin and CoffinManson equations, respectively. Under the strain control, the continuous cyclic softening was observed at 25 °C , however, the cyclic hardening appeared at 760 °C. At 25 °C, the fatigue crack of Inconel 625 superalloy welding joints initiated transgranularly at the specimen surface and propagated in the transgranular mode. Differently, at 760 °C, the fatigue crack initiated transgranularly at the specimen surface, but propagated in mixed transgranular and intergranular modes.
Published Version
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