On the interaction mechanisms between sources of hydrogen and Al-Si coated or bare high strength steels during the hot stamping process

Mandy, Mélodie;Georges, Cédric;Drillet, Pascal;Sturel, Thierry;Jacques, Pascal
(2015) EUROMAT 2015 - European Congress and Exhibition on Advanced Materials and Processes — Location: Varsovie, Pologne (20.September.2015)

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Authors
  • Mandy, MélodieUCLouvain
    Author
  • Georges, CédricCRM Group
    Author
  • Drillet, PascalArcelor Mittal R
    Author
  • Sturel, ThierryArcelor Mittal R
    Author
  • Jacques, PascalUCLouvain
    Author
Abstract
The economic and ecological challenges of the automotive industry coupled to safety considerations involve lightweight design based on the development of new ultra high strength materials. The hot stamping process of Al-Si coated steels ensures these strength levels and, moreover, allows an easy forming of the material without the necessity of a controlled atmosphere. At high temperatures, the coating is hydrogen-permeable, while at low temperatures (below 120°C), it becomes tight to hydrogen. In this context, the aim of this work is to understand how hydrogen enters in the material during the hot stamping process with respect to different atmospheric sources. An important aspect of the problem is the continuous evolution of the material during the hot stamping process. At ambient temperature, the coating is indeed a solid Al-Si alloy, which has weakly reacted with iron during deposition. As temperature increases, this coating first melts and then forms ternary intermetallic compounds Al-Fe-Si. These different subsystems of the material have been studied and compared to bare steel. The influence of the different hydrogen sources on bare and coated steels were also scrutinised: water vapour, which is probably the active source in the industrial process and dihydrogen, a more fundamental study case. Heavy water vapour (D2O) is also used to ensure a controlled atmosphere in the furnace, while it allows to avoid misinterpretation that could arise with the dissociation of water into hydrogen.
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Mandy, M., Georges, C., Drillet, P., Sturel, T., & Jacques, P. (2015). On the interaction mechanisms between sources of hydrogen and Al-Si coated or bare high strength steels during the hot stamping process. EUROMAT 2015 - European Congress and Exhibition on Advanced Materials and Processes, Varsovie, Pologne. https://hdl.handle.net/2078.5/71665