17 KB519 KB16 KB200020242004Hnilica, FrantišekJurči, PeterStolař, PavelSuchánek, Janštevilka:1/2letnik:385 stranistr. 13-17ISSN:1580-2949COBISSID:341162URN:URN:NBN:SI:doc-3PISCXHCenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijefazejeklomikrostrukturanitriranje v plazmipovršinske lastnostisestavatrdotaMicrostructural features of Cr-V ledeburitic saturated with nitrogen|This paper reports on the microstructure, the hardness and microhardness, the nitrogen-concentration depth profiles and the phase constitution of plasma-nitrided P/M VANADIS 6 cold-worked steel. The initial microstructure ofthe steel consists of a matrix with twinned and dislocated martensite and particles of the carbides, MC and Msub(7)Csub(3). After plasma nitriding the surface hardness and microhardness increased as a result of the nitrogen that diffused into the near-surface region. During the first stage the martensite is saturated with nitrogen, and after the solid-solubility limit isexceeded, nitrides like Fesub(4)N and Fesub(3)N are formedJeklo P/M VANADIS 6 za delo v hladnem je bilo nitrirano v plazmi. Preiskovane so bile pomembne lastnosti površine, kot so mikrostruktura, trdota in miktrotrdota, profil koncentracije dušika ob površini in sestava faz. Pred nitriranjem v plazmi je bila matrica iz dvojčičnega in dislokacijskega martenzita in iz karbidov MC in Mspodaj(7)Cspodaj(3). Po nitriranju se je povečala trdota in miktrotrdota površine zaradi difuzije dušika, ki se je najprej bogatil v martenzitu. Po preseženi topnosti pa so nastale nitridne faze Fespodaj(4)N in Fespodaj(3)NTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije