Effects of the cryogenic wire brushing on the surfaces integrity andthe fatigue life improvements of the AISI 304 StainlessSteel ground components

摘要

In this investigation, ground surface integrity and fatigue behavior improvements of the AISI 304 SS resulting fromthe application of wire brushing at ambient and low temperatures were investigated.It was found that the coldwork hardening generated by the cryogenic brushing increases the levels of the compressive residual stressescomparatively to the dry brushing and therefore, results on higher nucleation fatigue lifetime of mechanicalcomponents having undergone this treatment.On the other hand the propagation fatigue lifetime of thesecomponents was found to be extended by plastic induced martensite formed at the tips of the nucleated fatiguecracks.The realized improvement rates expressed in terms of endurance limits at 2x106 cycles comparatively tothe ground state are 47% for the dry brushing conditions and 72% fro the cryogenic brushing.