TDS study of deuterium distribution in 3$^{rd}$ generation high strength steels as a function of charging conditions and cold rolling

A. Pushparasah (1) , F. Martin (1) , Q. Auzoux (1) , T. Dieudonne (2) , S. Cobo (2) , L. Moli-Sanchez (2) , K. Wolski (3)

1 CEA-DES (ex-DEN) - CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire)
2 ArcelorMittal Global Research and Development Maizières Automotive Product
3 ENSM ST-ETIENNE - Ecole Nationale Supérieure des Mines de St Etienne

Two 3$^{rd}$ generation steels were studied an austenitic-ferritic MnAl steel and an austenitic-martensitic quenched and partitioned (QetP) steel. Hydrogen absorption during elaboration was simulated by exposing the steels to deuterium atmosphere during their final thermal treatment. Nitrogen-exposed specimens were also deuterium cathodically charged in order to simulate hydrogen entry in the steels during an optional electrogalvanization process. Thermal desorption mass spectrometry (TDS), combined with aging at room temperature and cold rolling, was used to study diffusion and trapping. The evolution of different TDS spectral contributions with aging and cold rolling allowed educated guesses on their origin. Peaks specific to martensitic transformation were identified.

Keywords: hydrogen; deuterium; high strength steels; cold rolling; thermal desorption spectrometry

Domains: Nuclear Experiment [nucl-ex]; Nuclear Theory [nucl-th]

A. Pushparasah, F. Martin, Q. Auzoux, T. Dieudonne, S. Cobo, et al.. TDS study of deuterium distribution in 3$^{rd}$ generation high strength steels as a function of charging conditions and cold rolling. 3rd International Conference on Metals and Hydrogen "SteelyHydrogen2018", May 2018, Gand, Belgium. ⟨cea-02339124⟩