Computational model for carbon diffusion and methane formation in a ferritic steel during hydrogen attack

Abstract

Computational model for carbon diffusion and methane formation in a ferritic steel during hydrogen attack Schl"gl, S.M.; van der Giessen, E.; Schlögl, S.M. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. AbstractHydrogen attack is a material degradation process which involves partial dissolution of the microstructure in favor of the growth of methane-filled cavities. The various physical-chemical processes involved are strongly coupled. We present a numerical microstructural model for two of these processes, based on a variational approach. Ó

A Nucleation Mechanism of Hydrogen Blister in Metals and Alloys

“…Many models [5,7,23] of hydrogen-induced cracking in steel suggest that the hydrogen atoms diffuse to low free energy locations, for example, the interface of matrix and inclusions such as manganese sulfides (MnS). At these locations, the hydrogen atoms can combine to form hydrogen molecules that will exert a pressure on the surrounding steel, resulting in a crack.…”

Suppression of hydrogen-induced damage in friction stir welded low carbon steel joints

“…In addition, the hydrogen atom is prone to diffuse to low free energy locations, for example, the interface of the matrix and inclusions such as MnS particles and cementite particles. When the pressure in the crack exceeds a critical value, the crack starts to grow [29]. The hydrogen induced damage has a great influence on the mechanical properties of the materials and can be the initial site of fracture under external stress.…”

Diffusion Behavior of Carbon Atoms in Austenite Region of SCM435 Steel

“…Great efforts have been developed on the diffusion due to the important influence on the metal processing technology and metal performance. Some achievements have been obtained [1][2][3]. For example, Takahama [4] studied phase field simulation of the carbon redistribution during the quenching and partitioning process in a low-carbon steel; K. Nakajima [5] studied the role of carbon diffusion in ferrite on the kinetics of cooperative growth of pearlite; S.J.…”