Low Cycle Fatigue Behavior of Spray Formed Superalloy Rings

Wen Yong Xu; Guo Qing Zhang; Zhou Li

doi:10.4028/www.scientific.net/AMR.399-401.1937

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 399-401Low Cycle Fatigue Behavior of Spray Formed...

Low Cycle Fatigue Behavior of Spray Formed Superalloy Rings

Abstract:

Low cycle fatigue behavior of spray formed superalloy GH738 at 650°C has been investigated under fully reversed total strain-controlled mode. When strain amplitude (Δε_t/2) is between 0.32% and 0.4%, cyclic stress response is stable under fully reversed constant total strain amplitude. The stabilized hysteresis loops narrowing sharply to a straight line indicates that the alloy exhibits typical elastic strain. The crack initiates single site from the surface. When strain amplitude is between 0.6% and 1.0%, cyclic hardening is observed until fracture. The tendency for hardening is found to increase with strain amplitude. The hyperesis loops expand gradually, which indicates that plastic deformation happens during cyclic deformation process. The crack initiates multi-sites from the surface. The cyclic strain-stress relationship of spray formed GH738 at 650°C can be illustrated by Δσ/2 =2017(Δε_p/2)0.1489.The total strain-life function can expressed by Δε_t/2=0.0071(2N_f) _-0.0781 +0.0647(2N_f) ) _-0.4914.

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Advanced Materials Research (Volumes 399-401)

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1937-1941

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https://doi.org/10.4028/www.scientific.net/AMR.399-401.1937

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November 2011

Authors:

Wen Yong Xu, Guo Qing Zhang, Zhou Li

Keywords:

GH738, Low Cycle Fatigue, Spray Forming, Superalloy

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