17 KB222 KB15 KB199219991999Leskovšek, VojtehPodgornik, BojanVižintin, Jožefštevilka:1/2letnik:33str. 51-54ISSN:1318-0010COBISSID:137898URN:URN:NBN:SI:doc-XKQBI67SslInštitut za kovinske materiale in tehnologijeŽelezarna JeseniceŽelezarna RavneŽelezarna ŠtoreKovine zlitine tehnologijejeklonitriranjetribološke lastnostiProtiobrabne lastnosti jekla 42CrMo4, nitriranega v nepulzirajoči in pulzirajoči plazmi| Wear properties of plasma and pulse plasma nitrided 42CrMo4 steel|The tribological properties of plasma and pulse plasma nitrided 42CrMo4 steel were investigated and compared to hardened steel. Contact surfaces of the samples were characterized by metallographic, SEM microscopic, microhardness and profilometric techniques before and after wear testing. Wear tests were performed on a pin-on-disc wear testing machine in which nitrided pins were mated to hardened ball bearing steel discs under dry sliding conditions. The resulting wear loss as well as the coefficient of friction were monitored as a function of load, sliding speed and test time. Results show improvement of the tribological properties of 42CrMo4 steel after plasma and pulse plasma nitriding. Improvement becomes more evident when the testing conditions become more severe. It was also found that the compound layer should be removed from the nitrided surface to avoid impairment of the tribological properties by its fracture followed by the formation of hard abrasive particlesRaziskali smo tribološke lastnosti jekla 42CrMo4, nitriranega v nepulzirajoči in pulzirajoči plazmi, pri čemer je bilo kaljeno jeklo uporabljeno kot referenca. Z uporabo metalografije, elektronske in optične mikroskopije, merjenja mikrotrdote in topografije površine smo natančno karakterizirali kontaktno površino pred drsnim preizkusom in po njem. Ti preizkusi so bili narejeni na napravi, imenovani valjček-disk, pri suhem drsenju. Med njimi smo spreminjali koeficient trenja in količino obrabe v odvisnosti od obremenitve, drsne hitrosti in časa. Rezultati so pokazali, da se je obrabna odpornost jekla 42CrMo4 z nitriranjem izboljšala, kar je postalo pri stopnjevanju preizkušanja vedno bolj izrazito. Ugotovljeno je bilo, da je treba spojinsko plast z nitrirane površine odstraniti, saj lahko ta plast zaradi svoje krhkosti in visoke trdote celo poslabša obrabno odpornost jeklaNadaljuje se kot: Materiali in tehnologijeTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije