Abstract
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, which can be utilized for microstructural assessment and correlated to achieve maximum material performance of structural alloys. In high nitrogen-strengthened stainless steel welds, nitrogen partitions into solid solution nitrogen and nitrides during the welding thermal cycle. The formation of nitrides results in a degradation of mechanical properties and corrosion resistance. Thermoelectric power measurements offer a means to assess the weld interstitial nitrogen content allowing for a better correlation between nitrogen content and weld metal microstructure and properties. The thermoelectric power coefficient has been measured on plasma gas-tungsten arc welds on nitrogen-strengthened austenitic stainless steel alloy 1.4565, which has been interstitially strengthened with nitrogen for enhancement in mechanical properties and corrosion resistance.
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Lasseigne, A. Henry Granjon Prize Competition 2006 Winner, Category C “Design and structural integrity” Non-Destructive Determination of Interstitial Nitrogen Content in Austenitic Stainless Steel Weld Metal Utilizing Thermoelectric Power. Weld World 50, 35–39 (2006). https://doi.org/10.1007/BF03263443
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DOI: https://doi.org/10.1007/BF03263443