The Making of Vacuum Induction Melting Furnace and the Survey of the Influences of Temperature and Material of Crucible on Created Type of Inclusion in Super Alloyed Based Nickel IN738LC

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Enayati, Naser | 2009

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 39320 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Halali, Mohammad
Abstract:
The purpose of this project is to survey the created kind of inclusion in super alloyed based nickel. primarily, for this matter for the preparing of super alloyed based nickel, the vacuum induction melting furnace has been designed and built , then for surveying the kind of inclusion the effective parameters such as temperature , timing and material of crucible has been considered accordingly , the material of crucibles was considered based on mud-clay- graphitic- pure graphitic- aluminum- zirconium. From the obtained analysis samples of SEM has been distinguished which, with increasing of the temperature and the time ,the percentage of impurity will go up in super- alloyed and the research of aluminum crucible , presents , in low temperature a few amount of impurity will enter to melt , but in high temperature and after spending long time the inclusion of SiO 2 and AL2 O3 as a complex will constitute in melt. From all of these, the zirconium crucible has been suitable for t he melt of super alloyed- based nickel, but in high temperature and time, the ZrO2 inclusion will enter to the melt, because of the corrosion of melt with wall of furnace
Keywords:
Nickel-Base Superalloy ; Induction Furnace ; Vacuum Induction Melting (VIM)Process ; Inclusion

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