Superalloys: An Introduction with Thermal Analysis

1
Syed Shehzad Raza
Syed Shehzad Raza
1 Allama Iqbal College of Technology

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Nickel based superalloys are commonly used materials in the aero industry and more specifically in the hot section of aero engines. These nickel and nickel iron based superalloys are precipitation strengthened alloys with a face centered cubic gamma matrix. Alloy 718, Allvac 718Plus and Waspaloy have been of great interest in the present study. Alloy 718 is a precipitation strengthened nickel-iron based alloy having gamma double prime phase (Ni 3 Nb) as a main strengthening phase up to 650 °C. Waspaloy, another precipitation strengthened nickel base superalloy, has a very good strength at temperatures up to ~750 °C whereas Allvac 718Plus is a newly developed nickel based precipitation strengthened superalloy which retains good mechanical properties at up to ~700 °C. These three alloys were investigated in terms of how their respective solidification process reveals upon cooling.Latent heat of soloidification has been estimated for all three alloys. Differential thermal analyses (DTA) have been used to approach the task. It was seen that Waspaloy has the smallest solidification range whereas Allvac 718Plus has the largest solidification interval in comparison.

8 Cites in Articles

References

  1. C Sims,N Stoloff,W Hagel,Superalloys Unknown Title.
  2. Matthew Donachie,Stephen Donachie (2002). Superalloys.
  3. G Knorovsky,M Cieslak,T Headley,A Romig,Jr,W (1987). Hammetter INCONEL 718: A Solidification Diagram Metallurgical Transactions A.
  4. Hasse Fredriksson,Ulla Solidification and Crystallization Processing in Metals and Alloys.
  5. T Antonsson,Fredriksson (2005). H The effect of cooling rate on the solidification of Inconel 718.
  6. J King,H Mccoy,P Rittenhouse (2002). Weldability Evaluations and Weldment Properties of Hastelloy X.
  7. H Fredriksson,B Rogberg (1979). Thermal analysis for. interpretation of solidification cycle.
  8. R Kennedy (2005). Allvac 718Plus, Superalloy for the Next Forty Years.

Funding

No external funding was declared for this work.

Conflict of Interest

The authors declare no conflict of interest.

Ethical Approval

No ethics committee approval was required for this article type.

Data Availability

Not applicable for this article.

Syed Shehzad Raza. 2015. \u201cSuperalloys: An Introduction with Thermal Analysis\u201d. Global Journal of Research in Engineering - G: Industrial Engineering GJRE-G Volume 15 (GJRE Volume 15 Issue G2): .

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Journal Specifications

Crossref Journal DOI 10.17406/gjre

Print ISSN 0975-5861

e-ISSN 2249-4596

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GJRE-G Classification: FOR Code: 091207
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v1.2

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July 14, 2015

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English

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Nickel based superalloys are commonly used materials in the aero industry and more specifically in the hot section of aero engines. These nickel and nickel iron based superalloys are precipitation strengthened alloys with a face centered cubic gamma matrix. Alloy 718, Allvac 718Plus and Waspaloy have been of great interest in the present study. Alloy 718 is a precipitation strengthened nickel-iron based alloy having gamma double prime phase (Ni 3 Nb) as a main strengthening phase up to 650 °C. Waspaloy, another precipitation strengthened nickel base superalloy, has a very good strength at temperatures up to ~750 °C whereas Allvac 718Plus is a newly developed nickel based precipitation strengthened superalloy which retains good mechanical properties at up to ~700 °C. These three alloys were investigated in terms of how their respective solidification process reveals upon cooling.Latent heat of soloidification has been estimated for all three alloys. Differential thermal analyses (DTA) have been used to approach the task. It was seen that Waspaloy has the smallest solidification range whereas Allvac 718Plus has the largest solidification interval in comparison.

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Superalloys: An Introduction with Thermal Analysis

Syed Shehzad Raza
Syed Shehzad Raza Allama Iqbal College of Technology

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