High Temperature Corrosion Resistance of Mechanically Alloyed Products in Gas Turbine Environments

Smith, Gaylord D.; Fischer, J. J.

doi:10.1115/90-gt-206

Cited by 1 publication

(2 citation statements)

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“…While they exhibit high-temperature strength surpassing the state of the art, their oxidation resistance is far from ideal. For example, the mass gain at T=1000 • C for TiZrNbHfTa during 1 hour in air is 65 mg/cm 2 , almost an order of magnitude higher than the Cr 2 O 3 -forming wrought Ni-based superalloys [11,12]. Thus, efforts are underway to design RCCAs capable of growing effective oxide scales at temperatures above 1000 • C [11,13].…”

Section: Introductionmentioning

confidence: 99%

“…Beyond RCCAs high-temperature protective oxides are required in a range of applications. Carefully engineered oxide scales can be used to prevent further oxidation and embrittlement of alloys in high temperature applications [11,12], corrosion resistance in adverse environments [12], or as a protective coating during aerospace re-entry applications [5].…”

Section: Introductionmentioning

confidence: 99%

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Expanding materials selection via transfer learning for high-temperature oxide selection

McClure¹,

Strachan²

2020

Preprint

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Materials with higher operating temperatures than today's state of the art can improve system performance in several applications and enable new technologies. Under most scenarios, a protective oxide scale with high melting temperatures and thermodynamic stability as well as low ionic diffusivity is required. Thus, the design of high-temperature systems would benefit from knowledge of these properties and related ones for all known oxides. While some properties of interest are known for many oxides (e.g. elastic constants exist for over 1,000 oxides), melting temperature is known for a relatively small subset. The determination of melting temperatures is time consuming and costly, both experimentally and computationally, thus we use data science tools to develop predictive models from the existing data. The relatively small number of available melting temperature values precludes the use of standard tools; therefore, we use a multi-step approach based on sequential learning where surrogate data from first principles calculations is leveraged to develop models using small datasets. We use these models to predict the desired properties for nearly 11,000 oxides and quantify uncertainties in the space.

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