20 KB559 KB14 KB200020262010Balcar, MartinGodec, MatjažJenko, MonikaSkobir Balantič, Danijela Anicaletnik:44številka:6str. 343-347ISSN:1580-2949COBISSID:841642URN:URN:NBN:SI:doc-XWYN2XF8enInštitut za kovinske materiale in tehnologijeMateriali in tehnologijemehanske lastnostimikrolegirana jeklamikrostrukturaThe influence of the microalloying elements of HSLA steel on the microstructure and mechanical properties| Vpliv mikrolegirnih elementov na mikrostrukturo in mehanske lastnosti HSLA jekla|In this work, hot-forged, high-strength, low-alloy (HSLA) steels based on the chemical composition 34CrNiMo6 were investigated in order to determine the type of precipitates forming and their effect on the mechanical properties. The individual steels were microalloyed with one of the following elements or a combination of elements: niobium, titanium or zirconium and vanadium. The compositional changes in the microstructure and the various kinds of precipitates observed in the microalloyed steels were examined using energy-dispersive spectroscopy (EDS). Optical and scanning electron microscopy studies revealed that the addition of microalloying elements did not change very much the main microstructural features due to the fact that all the microstructures consisted of tempered martensite and finely dispersed carbide precipitates along martensite laths. In all the microstructures relatively large precipitates of the microalloyed elements were observed. This could be a possible reason for observing no significant improvement in the mechanical propertiesVroče kovano jeklo HSLA kemijske sestave 34CrNiMo6 smo raziskovali z namenom, da bi določili vrsto precipitatov, ki se tvorijo, in njihov vpliv na mehanske lastnosti. Posamezna jekla so bila mikrolegirana z enim od nasledn!ih elementov ali s kombinacijo le-teh: z niobijem, s titanom ter cirkonijem in z vanadijem. Mikrostrukturne spremembe in različne vrste precipitatov smo študirali z metodo EDS. Preiskave s svetlobnim in vrstičnim elektronskim mikroskopom so potrdile, da dodatek mikrolegirnih elementov ni bistveno spremenil osnovne mikrostrukture, saj so bile vse mikrostrukture iz popuščenega martenzita z izločenimi karbidnimi precipitati po martenzitnih letvah. Pri vseh mikrostrukturah so bili opaženi tudi precej veliki precipitati mikrolegirnih elementov, ki so po vsej verjetnosti razlog za to, da se mehanske lastnosti niso bistveno izboljšaleTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije