20.500.12556/DKUM-53066 Mikrostruktura industrijsko kontinuirno ulite Ni-superzlitine GMR 235 Microstructure of plant continuously cast Ni-based superalloy GMR 235 Raziskali smo mikrostrukturo horizontalno kontinuirno ulitega droga Ni-superzlitine GMR 235 s premerom 50 mm, da bi pojasnili procese pri litju. Mikrostruktura je bila sestavljena iz matice γ (trdne raztopine na osnovi niklja), v kateri so bili izločki γ'(Ni3(Al, Ti)). Pretežno v meddendritnem prostoru so bile {e naslednje faze: karbid MC ((Mo,Ti)C), borid M3B2 – ((Mo,Cr)3B2) ter karbonitrid Ti(C, N). Velikost, oblika in porazdelitev faz je bila odvisna od lokalnih strjevalnih razmer. Podrobneje smo raziskali območji okoli primarne in sekundarne oznake, ki nastaneta zaradi načina vleka in konstrukcije kokile. Mikrostrukturna karakterizacija na teh mestih je omogočila vpogled v procese, ki potekajo pri nastajanju trdne skorje pri strjevanju. To znanje potrebujemo pri optimiranju procesnih parametrov, da bi dosegli zanesljivo kontinuirno litje ter zahtevano kakovost droga. The aim of this work was to characterize the microstructure of horizontally continuously cast Ni-based superalloy GMR 235 (bar with 50 mm diameter) in order to get an insight into the processes taking place during continuous casting. The microstructure consisted of γ-matrix (Ni-rich solid solution) with γ’-Ni3(Al, Ti) precipitates. In addition, there were predominantly, in the interdendritic regions, also the following phases: MC-carbide, M3B2-borideand Ti(C, N)-carbonitride. Their size, morphology and distribution were dependent on local solidification conditions. The areas around the primary and secondary witness marks were investigated in detail enabling us to understand the processes taking place during the formation of the solid skin upon solidification. This knowledge is critical for optimisation of the process parameters in order to make the continuous casting process more reliable and to obtain the required properties. kontunuirno litje Ni-superzlitina GMR 235 mikrostruktura primarna oznaka sekundarna oznaka continuous casting Ni-superalloy GMR235 microstructure primary witness mark secondary witness mark true false true Slovenski jezik Angleški jezik Znanstveno delo 2015-07-10 19:11:19 2015-07-10 19:11:19 2022-06-02 03:08:50 2021-05-10 03:33:18 2004 0 0 str. 155-159 št. 3/4 Letn. 38 2004 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1580-2949 669.24:62018:621.74.047 106193664 8951062 1580-2949 URN:SI:UM:DK:PYMMMEIF Materiali_in_tehnologije_2004_Zupanic,_Boncina,_Krizman_Mikrostruktura_industrijsko_kontinuirno_ulite_Ni-superzlitine_GMR_235.pdf Materiali_in_tehnologije_2004_Zupanic,_Boncina,_Krizman_Mikrostruktura_industrijsko_kontinuirno_ulite_Ni-superzlitine_GMR_235.pdf 1 16EDA4DE636B70BC5B0C22E464DADAF0 93dc47e8035af149472a50772b1b0e2cad32f153e52d38be388eed4ebc726109 fef6179a-7c0d-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=109917 http://mit.imt.si/Revija/izvodi/mit0434/zupanic.pdf 1 https://dk.um.si/Dokument.php?lang=slv&id=109916 Fakulteta za strojništvo 0 0 0