|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Advanced High-Strength Steels
||Hydrogen Solubility near Surfaces and Interfaces
||Robert Spatschek, Giorgia Gobbi, Claas Hueter, Aurab Chakrabarty, Ugur Aydin, Steffen Brinckmann, Joerg Neugebauer
|On-Site Speaker (Planned)
Hydrogen embrittlement is a major issue especially for high strength steels. Different mechanisms are proposed as reasons for this kind of material failure. We pursue here the formation of hydrides on a theoretical basis, using scale bridging descriptions. In particular, we investigate phase separation including elastic coherency effects in the bulk and at surfaces and find a reduction of the solubility limit in the presence of free surfaces. This mechanism favours phase separation near free surfaces even in the absence of external stresses. The theoretical framework is applied to different metals and compared to experimental findings. Ultimately, a reduction of the solubility limit by up to two orders of magnitude at room temperature in the presence of free surfaces can occur, which may favour hydrogen embrittlement.
||Planned: Supplemental Proceedings volume