20.500.12556/DKUM-65173 Continuous vertical casting of a NiTi alloy Vertikalno kontinuirno litje NiTi zlitine In this paper we present research that is connected to the performance of a series of experiments combined with the vacuum-induction melting and continuous vertical casting of a NiTi alloy in order to produce the strand. The theoretical chosen parameters made it possible to obtain a continuously cast strand with a diameter of 11 mm. The strand microstructures were investigated with a light and scanning electron microscope, while the chemical composition of the single phase was identified with the semi-quantitative micro-analysis energy-dispersive X-ray spectroscopy and inductively coupled plasma – optical emission spectrometry. The research showed that the microstructure is dendritic, where in the inter-dendritic region the eutectic is composed of a dark NiTi phase and a bright TiNi3–x phase. In some areas we found Ti carbides and phases rich in Fe. The micro-chemical analysis of the NiTi strand showed that the composition changed over the cross and longitudinal sections, which is proof that the as-cast alloys are inhomogeneous. In the final part, the electrochemical behaviours of NiTi strand samples were compared to a commercially available NiTi cast alloy with the same composition. V tem prispevku predstavljamo raziskavo, ki je povezana z izvedbo niza preizkusov vakuumskega pretaljevanja in sočasnega kontinuirnega vertikalnega litja NiTi zlitine s ciljem odliti palico. Teoretično izbrani parametri so omogočili, da smo uspeli kontinuirno odliti NiTi palico s premerom 11 mm. Dobljeno mikrostrukturo palice smo raziskali s svetlobnim in vrstičnim elektronskim mikroskopom, kemijsko sestavo posameznih faz pa smo identificirali s semi-kvantitativno mikro-kemično analizo Energijsko disperzijsko spektrometrijo in z optičnim emisijskim spektrometrom z induktivno sklopljeno plazmo. Preiskave so pokazale, da je mikrostruktura dendritska, medtem ko s v meddendritskem prostoru nahaja evtektik, sestavljen iz temne NiTi faze in svetle TiNi3–x faze. Mestoma smo identificirali tudi Ti karbide in fazo bogato s Fe. Mikro-kemična analiza NiTi palice je odkrila, da se sestava spreminja po prerezu in po dolžini, kar nakazuje, da je zlitina po strjevanju nehomogena. V zaključnem delu smo primerjali elektrokemijsko obnašanje vzorcev NiTi palice s komercialno dostopno valjano NiTi zlitino enake sestave. NiTi alloy continuous vertical casting microstructure potentiodynamic and impedance test NiTi zlitina vertikalno kontinuirno litje mikrostruktura potenciodinamični in impedančni test true false true Inštitut za kovinske materiale in tehnologije Ljubljana Angleški jezik Slovenski jezik Znanstveno delo 2017-03-14 15:54:39 2017-03-14 15:57:03 2022-07-07 03:08:30 2019-07-11 15:09:54 2016 0 0 str. 981-988 št. 6 Letn. 50 2016 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1580-2949 621.74.047:669.24:669.295 106193664 20059926 10.17222/mit.2016.111 1580-2949 URN:SI:UM:DK:36SBLQT3 Materiali_in_tehnologije_2016_Stambolic_et_al._Continuous_vertical_casting_of_a_NiTi_alloy.pdf Materiali_in_tehnologije_2016_Stambolic_et_al._Continuous_vertical_casting_of_a_NiTi_alloy.pdf 1 E96E4C45A0D9839753FCA644682DEEF7 55cabef9a713e2607424a627fe634ed1adacd147504bf253b1ee9feb71a0630c fca0bca8-7c0d-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=109809 http://mit.imt.si/Revija/izvodi/mit166/stambolic.pdf 1 https://dk.um.si/Dokument.php?lang=slv&id=109808 Fakulteta za strojništvo 0 0 0