RT journal article
T1 Investigation of Friction Hydro-Pillar Processing as a Repair Technique for Offshore Mooring Chain Links
A1 Dos Santos, Rafael Eugenio
A1 Chludzinski, Mariane
A1 Menezes Nunes, Rafael
A1 Reppold Marinho, Ricardo
A1 Torres Piza Paes, Marcelo
A1 Reguly, Alfonso
A2 Ciencia de los Materiales e Ingeniería Metalúrgica y Química Inorgánica
K1 friction hydro-pillar processing
K1 mooring steel grade R4
K1 PWHT
K1 residual stress
K1 neutron diffraction
AB Repairing links of offshore mooring chains has presented a significant industry challenge, primarily arising from modifications in material properties, encompassing alterations in microstructure, hardness, and residual stress. In this context, the present work investigates the method of friction hydro-pillar processing (FHPP) applied to R4 grade mooring chain steel. Joints in as-repaired and post-weld heat treatment (PWHT) conditions were subjected to residual stress (RS) tests using the neutron diffraction technique, microhardness mapping, and microstructural evaluations. The process generated peaks of tensile and compressive stresses in different directions and hardness below that of the parent material in the softening zone. The friction zone promoted high hardness levels in the thermo-mechanically affected zone (TMAZ) with a maximum of 19% of the ultimate tensile strength of the parent material. As expected, the PWHT restored the RS and reduced the hardness; however, 4 h PWHT allowed the elimination of a hardness higher than that of the base material.
PB MDPI
SN 2504-4494
YR 2023
FD 2023
LK http://hdl.handle.net/10498/36457
UL http://hdl.handle.net/10498/36457
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 11-nov-2026