|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Atom Probe Tomography for Advanced Characterization of Metals, Minerals and Materials
||Issues with Atom Probe Quantification of Nitrogen in Steels
||Frederic Danoix, Raphaële Danoix, Andrius Martinavicius, Mohamed GOUNE, Hugo Van Lendeghem, François Vurpillot
|On-Site Speaker (Planned)
Even if it is not as widespread as carbon in the steels, nitrogen is an important alloying element, used also for surface processing. As the FeN phase diagram shows important similarities with the Fe-C one, potentially opening a low-cost high-performance ‘nitrogen metallurgy’ route. However, similarly to carbon, nitrogen is a light element difficult to trace and quantify at the sub micrometer scale with conventional techniques. Atom probe tomography can play a central role in nitrogen metrology, provided some analytical aspects are clarified. Probably the most important one is the overlap between Si2+ (a major alloying element in modern steels) and N+ at 14 Da in APT mass spectra. We will discuss this aspect on the basis of the use of 15N isotopically enriched steels. We will also discuss and illustrate the potential for separation of the two contributions of N and Si peaks at 14 Da with current instruments.
||Planned: Supplemental Proceedings volume