The Halogen Effect for Ni-Base Superalloys – A Thermodynamic Study

Hans Eberhard Zschau; Patrick J. Masset; Michael Schütze

doi:10.4028/www.scientific.net/MSF.638-642.2375

Paper Titles

Heat Treatment and Oxidation Characteristics of Nb-20Mo-15Si-5B-20(Cr,Ti) Alloys from 700 to 1400°C
p.2351

Dynamic Recrystallization Behavior of GH4586 Superalloy during Hot Compression
p.2357

The Precipitation Strengthening Effect of Nb, Ti and Al in Cast/Wrought Ni-Base Superalloys
p.2363

Study on the Ultrahigh Speed Grinding of Superhard Materials with Squeeze Film Damping Technology
p.2369

The Halogen Effect for Ni-Base Superalloys – A Thermodynamic Study
p.2375

Residual Stress in PVD-Coated Carbide Cutting Inserts - Applications of the sin²ψ and the Scattering Vector Method
p.2383

Influence of Steel Grain Size on Residual Stress in Grinding Processing
p.2389

X-Ray Investigation on Strength of Thin Films
p.2395

The Effect of Grain Size on Strain Determination Using a Neutron Diffractometer
p.2405

HomeMaterials Science ForumMaterials Science Forum Vols. 638-642The Halogen Effect for Ni-Base Superalloys – A...

The Halogen Effect for Ni-Base Superalloys – A Thermodynamic Study

Abstract:

A new method for the oxidation protection of Ni-base superalloys with relatively low Al-content is proposed. By using the halogen effect the Al activity on the surface can be increased. Thus, the formation of a pure protective alumina scale becomes possible. The alloys IN738 and IN939 are considered in the present paper. Thermodynamic calculations for fluorine and chlorine predict the existence of the halogen effect for both alloys at temperatures between 900°C and 1200°C. The results also predict a change of the oxidation mechanism from internal alumina formation to external oxidation.

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Materials Science Forum (Volumes 638-642)

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2375-2380

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https://doi.org/10.4028/www.scientific.net/MSF.638-642.2375

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Online since:

January 2010

Authors:

Hans Eberhard Zschau, Patrick J. Masset, Michael Schütze

Keywords:

External Alumina Scale, Halogen Effect, Inward Growing Oxide, Nickel-Based Alloy

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