Abstract
The tension–tension fatigue behavior of low solid-solution hardening Ni-Cr alloys with an approximately constant stacking fault energy was systematically investigated under different stress amplitudes. With an enhancement of short range ordering (SRO) degree, the fatigue crack initiation mode is evolved from intergranular cracking to slip band cracking, and the cyclic deformation mechanism changes from wavy to planar dislocation slip. Both the fatigue strength coefficient (σ′f) and exponent (b) can be simultaneously increased by inducing SRO structure that greatly enhances the cyclic strain hardening capacity, deformation homogeneity and slip reversibility, and the fatigue life is thus significantly improved.
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