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Title:Mikrostruktura industrijsko kontinuirno ulite Ni-superzlitine GMR 235
Authors:Zupanič, Franc (Author)
Bončina, Tonica (Author)
Križman, Alojz (Author)
Files:.pdf Materiali_in_tehnologije_2004_Zupanic,_Boncina,_Krizman_Mikrostruktura_industrijsko_kontinuirno_ulite_Ni-superzlitine_GMR_235.pdf (176,55 KB)
MD5: 16EDA4DE636B70BC5B0C22E464DADAF0
 
URL http://mit.imt.si/Revija/izvodi/mit0434/zupanic.pdf
 
Language:Slovenian
Work type:Scientific work (r2)
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Abstract: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.
Keywords:kontunuirno litje, Ni-superzlitina, GMR 235, mikrostruktura, primarna oznaka, sekundarna oznaka
Year of publishing:2004
Number of pages:str. 155-159
Numbering:št. 3/4, Letn. 38
ISSN:1580-2949
UDC:669.24:62018:621.74.047
ISSN on article:1580-2949
COBISS_ID:8951062 New window
NUK URN:URN:SI:UM:DK:PYMMMEIF
Views:1027
Downloads:84
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Record is a part of a journal

Title:Materiali in tehnologije
Shortened title:Mater. tehnol.
Publisher:Inštitut za kovinske materiale in tehnologije
ISSN:1580-2949
COBISS.SI-ID:106193664 New window

Secondary language

Language:English
Abstract: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.
Keywords:continuous casting, Ni-superalloy, GMR235, microstructure, primary witness mark, secondary witness mark


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