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

IF 3.3 Q2 ENGINEERING, MANUFACTURING Journal of Manufacturing and Materials Processing Pub Date : 2023-11-09 DOI:10.3390/jmmp7060200

Rafael Eugenio dos Santos, Mariane Chludzinski, Rafael Menezes Nunes, Ricardo Reppold Marinho, Marcelo Torres Piza Paes, Afonso Reguly

{"title":"Investigation of Friction Hydro-Pillar Processing as a Repair Technique for Offshore Mooring Chain Links","authors":"Rafael Eugenio dos Santos, Mariane Chludzinski, Rafael Menezes Nunes, Ricardo Reppold Marinho, Marcelo Torres Piza Paes, Afonso Reguly","doi":"10.3390/jmmp7060200","DOIUrl":null,"url":null,"abstract":"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.","PeriodicalId":16319,"journal":{"name":"Journal of Manufacturing and Materials Processing","volume":" 5","pages":"0"},"PeriodicalIF":3.3000,"publicationDate":"2023-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Manufacturing and Materials Processing","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3390/jmmp7060200","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, MANUFACTURING","Score":null,"Total":0}

引用次数: 0

Abstract

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.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

摩擦水柱加工作为海洋系泊锚链修复技术的研究

海上系泊链的修复是一个重大的行业挑战，主要是由于材料性能的改变，包括微观结构、硬度和残余应力的改变。在此背景下，本文研究了R4级锚链钢摩擦水柱加工(FHPP)方法。采用中子衍射技术、显微硬度图和显微组织评价对修复后和焊后热处理(PWHT)条件下的接头进行了残余应力(RS)测试。该过程产生了不同方向的拉压应力峰值，软化区硬度低于母材。摩擦区促进了热机械影响区(TMAZ)的高硬度水平，最高可达母材极限抗拉强度的19%。正如预期的那样，PWHT恢复了RS并降低了硬度;然而，4小时PWHT允许消除硬度高于基材。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊