This paper correlates nonlinear material properties to nondestructive electronic measurements by using wave analysis techniques (e.g. Perturbation Methods) and incorporating higher-order phenomena. The correlations suggest that nondestructive electronic property measurements and practices can be used to assess thin films, surface layers, and other advanced materials that exhibit modified behaviors based on their space-charged interfacial behavior.
The electronic properties of an alloy correlate directly to its microstructure. The thermoelectric power coefficient has been determined in this investigation to be a rapid and accurate measurement that can be used for microstructural assessment and correlated to achieve the maximum material performance of structural alloys. In high-nitrogen-strengthened stainless-steel welds, nitrogen partitions into solidsolution nitrogen and nitrides during the welding thermal cycle. The formation of nitrides results in a degradation of the mechanical properties and the corrosion resistance. Thermoelectric power measurements offer a means of assessing the weld-interstitial nitrogen content, which allows for a better correlation between the nitrogen content and the weld-metal microstructure and properties. Using pressure-composition-temperature (PCT) (activity) diagrams, thermodynamic models are developed to describe the relationship between the thermoelectric power coefficient as a function of the interstitial nitrogen content and the formed nitride content. These correlations between the electronic property measurements and the interstitial nitrogen content will allow for a faster, nondestructive, and improved property prediction of nitrogen-strengthened stainless steels.
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