Microstructural behavior of SAF 2205 Duplex Stainless Steel Welded by Friction Hydro Pillar Processing

Abstract

The Friction Hydro-Pillar Process (FHPP) is an innovative process that has been recently studied regarding its possible in situ repair applications. There is still no literature about usage of the FHPP on duplex stainless steel (DSS) base materials to smaller forces than 25 kN. The investigation on DSS processing is crucial due his wide variety of critical uses in pipes and storage structures applied in chemical industry plants, where usual welding processes may lead to safety concerns. The aim of this study is to qualify the processing of SAF 2205 (UNS 31803) duplex stainless steel welded joints using FHPP as feasible repair procedure. For this, the studied samples were welded applying a range of axial forces. The welded joints were characterized by, α/γ phase ratio, intermetallic quantification, austenite spacing measurement, microhardness profile and microstructural qualitative studies. The results showed the efficiency in repair of the FHPP process on the production of DSS joints according with the material recommendations from the standard DNV-RP-F112.

Análise Quantitativa das Fases Presentes no Aço Inoxidável Duplex UNS S31803 Soldado pelo Processo MIG/MAG Curto-Circuito Convencional

“…Ferrita ( Nunes et al (2012), as melhores combinações de propriedades mecânicas e de resistência à corrosão para o aço UNS S31803 são garantidas quando o metal de solda apresenta teores de ferrita na faixa de 35-65%. Lessa et al (2016) apresenta uma quantidade satisfatória de ferrita na faixa de 55-68%, na região do MS. Lembrando que o valor da concentração de ferrita no MB é de 53,432%.…”

Processo De Soldagem Por Fricção Com Pino Consumível SFPC Aplicado No Aço Inoxidável Duplex Saf 2205

“…Este processo consiste de duas etapas principais: uma primeira de furação e uma segunda de preenchimento. Nesta última, o consumível ou material de preenchimento, que é um Pino metálico equivalente ao material a ser reparado, é rotacionado em alta velocidade (geralmente acima de 1000 rpm) e posteriormente é prensado contra a chapa que pode ou não ter um furo de geometria similar ao Pino [3]. As etapas são demonstradas na Figura 1.…”

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

“…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].…”