The Effect of Melt Holding Time and Vacuum Pressure on the High ‎Temperature Fatigue Life of Ni Based Hastelloy X Superalloy

Document Type : Original Research Article

Authors

1 Materials department, Malek Ashtar university of Technology, Tehran, Iran

2 M.Sc. Researcher,‎ Faculty of Materials & Manufacturing Technologies, Malek Ashtar University of ‎Technology, Tehran, Iran.‎

3 Professor, Faculty of Materials & Manufacturing Technologies, Malek Ashtar University of ‎Technology, Tehran, Iran.‎

10.22034/frj.2022.341770.1155

Abstract

The aim of this study is the improvement of fatigue properties via controlling the vacuum pressure and melt holding time. The vacuum pressure of 10-1 and 10-3 mbar were applied during melting in VIM and the melt were kept for 3 and 30 minutes. The results show that with increasing the pressure from 10-1 to 10-3 mbar at 3 and 30 min, the grain size increase from 44 to 66 µm and from 71 to 78 µm, respectively. Also, the volume fraction of carbides at 3 min decrease from 9.6 to 8.05 vol% with increasing the pressure and it also decrease with increasing time as well. High temperature low cycle fatigue test was carried out at strain of 0.6% and temperature of 750°C. At 3 and 30 min with increasing pressure, the cycling life increase 26% and 15%, respectively. At constant pressure, with decreasing time, the cycling lives also increase.

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Founding Research Journal
Volume 5, Issue 3 - Serial Number 18
September 2021
Pages 205-213

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History

  • Receive Date: 10 May 2022
  • Revise Date: 05 July 2022
  • Accept Date: 20 August 2022

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