With the increase in cycle times, the stress amplitude of all samples showed a trend of rapid increase and then slow decline, which meant that all samples exhibited initial cycle hardening, short-term cycle saturation, and subsequent cycle softening, as shown in Figure 8 b.
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Effects of the γ″-Ni<sub>3</sub>Nb Phase on Fatigue Behavior of Nickel-Based 718 Superalloys with Different Heat Treatments.
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