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Examination of wear, hardness and friction of N, B, C, Ag, Pb and Sn implanted steels with different chromium content

: Langguth, K.; Kobs, K.; Kluge, A.; Öchsner, R.; Ryssel, H.

Surface Modification of Metals by Ion Beam <1988, Riva del Garda>
Conference Proceedings
Fraunhofer IIS B ( IISB) ()
Ionenimplantation; Oberflächenmodifikation; Reibung; Stahlhärtung; Tribologie; Verschleiß

Implantations of nitrogen, boron, carbon, silver, lead and tin in 4 different steels with chromium content of 1,5 - 18 % were performed. The doses applied were between 10 high 17 and 5 x 10 high 17 cm high minus 2, the ion energy was 50 - 100 keV. Wear and friction of the implanted layers were tested using a pin-on-disc oscillating tribometer. Hardness was investigated using a microhardness tester allowing loads down to 0,05 x 10 high minus 2 N. It was found that nitrogen is very effective in hardening steels with high chromium content (about 18 %) and in decreasing the wear rate of up to 3 orders of magnitude. Microscopic observations of the abraded surfaces show a strong effect of fatigue after tribological stress in the case of unimplanted steels. Implanted surfaces have a smooth abrasive path even after a long period of testing. Boron reduces the wear of hardened X90CrMoV18 by two orders of magnitude. Carbon is very effective in hardening and reducing wear in the low chromium tool steel 100Cr6 which cannot be hardened by nitrogen implantation. All results strongly depend on atmosphere, load, and the ball material in use for friction tests. The implantation of silver, tin, and lead does not change the hardness of the steels investigated. However, a reduction of friction was found thus reducing also the wear rate.