Toughness properties of a friction hydro pillar processed offshore mooring chain steel

Publication date: Available online 27 May 2019Source: Journal of Materials Research and TechnologyAuthor(s): Diogo Trento Buzzatti, Mariane Chludzinki, Rafael Eugenio dos Santos, Jonas Trento Buzzatti, Guilherme Vieira Braga Lemos, Fabiano Mattei, Ricardo Reppold Marinho, Marcelo Torres Piza Paes, Afonso RegulyAbstractIn the past few years, solid-state welding has been a great alternative in comparison to the conventional fusion welding technologies. Solid-state welds are usually processed in lower temperatures than the other common fusion joints, tending to avoid problems such as hydrogen embrittlement, brittle microstructures and porosity. Therefore, these advantages can be useful to industrial applications which do not allow fusion welding. Offshore mooring components, which are fabricated under restricted standard requirements to ensure the floating marine integrity, is one of these applications. Thus, defects in links of mooring chains cannot be repaired by traditional welding, resulting in high operational costs. In this context, this study aims to characterize the Friction Hydro-Pillar Processing (FHPP) application to a mooring chain steel IACS UR W22 grade R4. The main process parameter studied was an axial force ranging from 30 to 60 kN. The welded joints were evaluated by metallography (macro and microstructure) and microhardness mapping. Furthermore, the toughness properties were assessed by Charpy and Crack Tip Opening Displacement (CTOD) tests, and the fract...
Source: Journal of Materials Research and Technology - Category: Materials Science Source Type: research