20 KB991 KB19 KB199219991997Doberšek, MirkoLeskovšek, VojtehRodič, Alenkaletnik:315 straništevilka:6str. 551-555ISSN:1318-0010COBISSID:39082URN:URN:NBN:SI:doc-UZI56O5AenInštitut za kovinske materiale in tehnologijeŽelezarna JeseniceŽelezarna RavneŽelezarna ŠtoreKovine zlitine tehnologijedebelinafazni diagramijeklanitriranje v plazmiporoznoststrukturatechnologytehnologijatrdotaPulse plasma nitrocarburising of gas shock absorber tubes from steel W.No. 1.0116| Nitrokarburiranje cevi plinskega blažilca iz jekla W.No. 1.0116 v pulzirajoči plazmi|Gas shock absorber tubes from steel W.No. 1.0116 were pulse plasma nitrocarburised at 560 and 580°C in atmosphere containing carbon dioxide additions. Variations in compound layer structure, thickness, porosity, hardness-depth profiles and stability of the process were investigated. It was found that the formation of preadominantly ?$\epsilon$?phase compound layer structure is promoted by high nitrogene atmosphere. The compound layer thickness was found to increase nitrogen content, temperature, and pulse as well as decreasing carbon dioxide content. The experiments showed that by use of high nitrogene atmosphere no pores appear in compound layers on steel W.No. 1.0116. Proper process control and the addition of carbon dioxide to the atmosphere with high content of nitrogene result in a reasonably thick compound layer from predominantly ?$\epsilon$?phaseNitrokarburiranje cevi plinskega blažilca iz jekla W.No. 1.0116 v pulzirajoči plazmi je bilo izvršeno pri temperaturi 560°C in 580°C v atmosferi z dodatkom ogljikovega dioksida. Raziskali smo mikrostrukturo spojinske plasti, debelino, poroznost ter profil trdote nitrokarburirane plasti in stabilnost procesa. Ugotovili smo, da se lahko z uporabo atmosfere, ki vsebuje visoki odstotek ?$N_2$?, poveča tvorba spojinske plasti, ki je pretežno sestavljena iz ?$\epsilon$?faze. Ugotovili smo, da debelina spojinske plasti raste z vsebnostjo ?$N_2$?, temperaturo in frekvenco pulziranja ter z znižanjem vsebnosti ogljikovega dioksida v atmosferi. Eksperiment je pokaza, da visoka vsebnost ?$N_2$? ne vpliva na nastajanje por v spojinski plasti, ki se tvori v jeklu W.No. 1.0116. Pravilno vodenje procesa ter dodatek ogljikovega dioksida v atmosfero z visoko vsebnostjo ?$N_2$? omogoča doseganje sprejemljive debeline spojinske plasti, ki je sestavljena pretežno iz ?$\epsilon$? fazeTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of Slovenia