Founding Research Journal

Founding Research Journal

Effect of Melt Holding Time on γ‏'‏‎ Precipitates and Stress Rupture ‎Properties of Rene 80 Superalloy

Document Type : Original Research Article

Authors
Saeed Kouhi Faeigh Dehkordi 1
Masumeh Seifollahi 2
Seyed Mahdi Abbasi 3
Seyed Mahdi Ghazi Mir Saeed 4
1 M.Sc., Materials Department, Malek Ashtar University of Technology. ‎
2 Assistant Professor, Materials Department, Malek Ashtar University of Technology. ‎
3 Associate Professor, Materials Department, Malek Ashtar University of Technology
4 M.Sc., Materials Department, Malek Ashtar University of Technology.‎
10.22034/frj.2019.176467.1074
Abstract
The purpose of this investigation, is study the effect of melt holding time (3 , 20 min) in vacuum induction melting furnace (VIM) with alumina crucible on the amount of gases, γ' precipitates and stress rupture properties of Rene 80 superalloy. For this purpose, the amount of O, N gasses and chemical composition were analyzed. The microstructure was assessed by scanning electron microscopy (SEM) and stress rupture properties was performed at 980˚C. The results showed that with increasing the melt holding time from 3 to 20 min, γ' volume fraction reduced from 46 to 37% and also, oxygen level of the alloys increased from 79 to 165 ppm because of the alumina reduction. The morphology of γ' changed from semi-cubic to cubic one. The result of mechanical test showed that the stress-rupture life of samples reduced from 22.6 to 19 hours by increasing melt holding time because of reducing γ' volume fraction.
Keywords
Melt holding time
VIM furnaces
γ' precipitates
Stress rupture properties
Rene 80 superalloy
Subjects
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  • Receive Date 17 March 2019
  • Revise Date 06 May 2019
  • Accept Date 11 May 2019