26 KB340 KB12 KB200020242013Cajner, FranjoKumić, IvanLandek, DarkoVugrinčić, Amalijaštevilka:4letnik:47str. 531-533COBISSID:1007274ISSN:1580-2949URN:URN:NBN:SI:doc-M5HZZ4WQenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijenitriding/carburizingnitriranjenitrocementiranjesurface hardnesstrdota površineInfluential factors in the surface-hardness testing of a nitrided layer| Vplivni faktorji pri preizkušanju trdote površine nitrirane plasti|Nitrocarburizing is one of the frequently applied processes that significantly improve the service life of steel parts in the complex activities of mechanical loads, wear and corrosion damages. Characterization and confirmation of the quality of a nitrided/nitrocarburized layer is a prescribed norm including a determination of the surface hardness, nitriding hardening depth, compound-zone thickness and its porosity. In the testing of the surface hardness, in spite of determined conditions, there are additional factors that can affect the obtained result and can lead to a misunderstanding between a customer and a provider of the service of nitriding. In this paper, possible influential factors related to the surface hardness are considered and statistically analyzed by the ANOVA two-factor test. The considered influential factors are: the surface-preparation method and the loading force. The tests carried out during the research indicated a significant influence of the loading force and of the surface preparation on the results of the nitrided/nitrocarburized-steel surface hardness. Also, the indentation size effect is confirmed in the hardness tests with a small loading forceNitrocementacija je pogosto uporabljen postopek, ki občutno izboljša zdržljivost jeklenih komponent pri kompleksnem delovanju mehanskih obremenitev, obrabe in korozijskih poškodb. Karakterizacija in potrditev kvalitete nitrirane/ nitrocementirane plasti je predpisana in vključuje določanje trdote površine, globino utrjevanja z nitridi, debelino spojinske cone in njeno poroznost. Pri preizkušanju trdote površine so kljub točno določenim pogojem prisotni še dodatni faktorji, ki lahko vplivajo na rezultate in lahko povzročijo nesoglasje med uporabnikom in izvajalcem nitriranja. V tem članku so mogoči vplivni faktorji obravnavani in statistično analizirani z ANOVA-preizkusom dveh faktorjev. Obravnavana faktorja sta: metoda priprave površine in sila obremenjevanja. Preizkusi so pokazali močan vpliv sile obremenjevanja in priprave površine na rezultate trdote nitrirane/nitrocementirane površine. Pri merjenju trdote z majhnimi obremenitvami pa je bil ugotovljen tudi vpliv velikosti odtisaTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije