Assessment reveals reduced fatigue durability in nickel alloys with higher surface roughness, indicating significant implications for mechanical properties.
Using an example of a high-strength nickel alloy VHz159, the characteristics of low-cycle fatigue of cylindrical solid and hollow samples synthesized by selective laser melting (SLM) have been determined. Samples with a working surface of different roughness were examined: Ra = 4.80 microns after SLM, Ra = 1.06 microns after vibratory finishing and Ra = 0.20 microns after polishing. The negative effect of surface roughness on fatigue durability was established: in vibratory finishing and untreated samples, as compared with polished ones, it was lower by 17%. The Manson-Coffin and Ramberg-Osgood curves indicate increased plasticity of the samples with an untreated surface and surface hardening after vibratory finishing. The results of fractographic studies demonstrated that the decrease in fatigue strength was associated with the presence of defects caused by peculiarities of exposure of surface elements, in hollow samples this decrease was greater.
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Evgenov et al. (2023) studied this question.
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