Fretting fatigue behaviour of Ni-free high-nitrogen stainless steel in a simulated body fluid

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Fretting fatigue behavior was studied in air and in phosphate-buffered saline(PBS(-)) for Ni-free high-nitrogen steel(HNS) and for cold-rolled SUS316L steel(SUS316L(CR)). The plain fatigue limit of HNS was lower than that of SUS316L(CR). The fretting fatigue limit of HNS was much higher than that of SUS316L(CR) in both air and PBS(-). It was revealed that HNS has much better fretting fatigue properties than SUS316L(CR) in both the environments. The influence of fretting on fatigue limit was not solely explained by friction stress of the fretting, but also by wear behavior and/or plastic deformation in the fretting region.