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

Buzzatti, Diogo Trento; Chludzinki, Mariane; Santos, Rafael; Buzzatti, Jonas Trento; Lemos, Guilherme Vieira Braga; Mattei, Fabiano; Marinho, Ricardo Reppold; Paes, Marcelo Torres Piza; Reguly, Afonso

doi:10.1016/j.jmrt.2019.04.002

Cited by 8 publications

(3 citation statements)

References 12 publications

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“…A conical diameter reduction with a semi-spherical geometry was machined in the tip studs, and a blind hole was opened in the plates, as shown in Figure 2. The parameters applied to perform FHPP were 1500 rpm rotation speed, 45 kN axial force, and 7 mm burn-off, without gas protection, and an open-air environment in the friction welding machine MPF-1000 [27]. After the FHPP procedures, the PWHT parameters applied were 1, 2, and 4 h at 590 • C with subsequent air cooling.…”

Section: Methodsmentioning

confidence: 99%

Investigation of Friction Hydro-Pillar Processing as a Repair Technique for Offshore Mooring Chain Links

dos Santos,

Chludzinski,

Nunes

et al. 2023

JMMP

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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.

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Section: Methodsmentioning

confidence: 99%

Investigation of Friction Hydro-Pillar Processing as a Repair Technique for Offshore Mooring Chain Links

dos Santos,

Chludzinski,

Nunes

et al. 2023

JMMP

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“…Their chemical compositions are not standardised, conventional or public, with the responsibility of their mechanical properties assumed by steel manufacturers and mooring chain manufacturers. In addition, the components manufactured with these steels are joined by the electrical resistance process of welding (flash butt welding) and heat treated to achieve the final mechanical properties requested (Buzzatti et al, 2019).…”

Section: Abstract ~Mooring Chain Steel ~R4 Steel ~Mechanical Properti...mentioning

confidence: 99%

Characteristics of Grade R4 Steel Manufactured by Ingot Casting and Used in the Production of Offshore Mooring Chains

Mainier,

Canto,

Meiriño

et al. 2023

Trans. Marit. Sci.

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The objective of this study is to characterise grade R4 steel manufactured by ingot casting that is used as the raw material for the production of offshore mooring chains. Rolled bars of grade R4 steel have been selected and metallographic analyses and micro hardness, tensile and Charpy V-notch impact tests performed. Tensile and Charpy V-notch impact tests have also been carried out on mooring links manufactured from the same grade R4 steel. Based on the results presented, the influence of the rolling reduction ratio of the bars and the influence of the ingot casting cooling and reheating process have been observed. Both factors have been found to increase product quality, particularly with respect to the central segregation and homogeneity of the rolled bars.

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“…Since no fusion is involved in the process, typical solidification-related problems are avoided, thus offering a convenient and economical way of repairing damaged components. Furthermore, the process is fast and can be completely automated [7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the residual stress distribution in repairs in H13 steel by friction hydro pillar processing

Amavisca

Fonseca

Diehl

et al. 2020

Science and Technology of Welding and Joining

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The distribution of residual stresses (RS) in repairs generated by Friction Hydro-Pillar Processing (FHPP) in AISI H13 was investigated. Three axial force levels, with consequent different deposition rates, were applied to replicate possible repaired conditions. The contour (CM) and X-ray diffraction (XRD) methods were employed for RS analysis in samples that were also evaluated through metallography, microhardness analysis, micro-tensile and Charpy testing. CM produced 2D maps of the RS in the joints, showing symmetrical distributions around the welded rod for all welded conditions. Other common features for all conditions were the maximum level of compressive RS, which was found in the TMAZ of the rod, and the maximum tensile residual stress, which was found near the HAZ of the base block. There was good agreement between the RS measurement techniques. Mechanical tests show similar tensile resistance for all conditions and an apparent increase in toughness at higher force levels.

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

Cited by 8 publications

References 12 publications

Investigation of Friction Hydro-Pillar Processing as a Repair Technique for Offshore Mooring Chain Links

Investigation of Friction Hydro-Pillar Processing as a Repair Technique for Offshore Mooring Chain Links

Characteristics of Grade R4 Steel Manufactured by Ingot Casting and Used in the Production of Offshore Mooring Chains

Investigation of the residual stress distribution in repairs in H13 steel by friction hydro pillar processing

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