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Nearly 100 cutting tools made of SK5M tool steel (DIN S 6-5-2-5) were implanted with 80keV nitrogen ions at fluences ranging from 1 to 5×10 17 cm −2 . The tool lifetimes were examined during routine shaping of roller-bearing rings made of LH15 bearing steel on the production line of an industrial roller-bearing manufacturer. It was found that the lifetime-dose dependence could be described...