The effect of Cathodic pre-charging on the ductility of UNS S32304 Lean Duplex stainless steel to hydrogen induced stress cracking

Name: Suphanut Cherdpongtakul

Organization : King Mongkut's University of Technology Thonburi. Department of Production Engineering

Email : suphanut.ch@mail.kmutt.ac.th

Name: Sombun Charoenvilaisiri

Organization : King Mongkut's University of Technology Thonburi. Department of Production Engineering

Email : sombun.cha@mail.kmutt.ac.th

Name: Ekkarut Viyanit

Organization : National Science and Technology Development Agency. National Metal and Materials Technology Center

keyword: Cathodic pre-charging

ThaSH: Lean manufacturing

; Hydrogen induced stress cracking

ThaSH: Stainless steel

ThaSH: Duplex stainless steel

ThaSH: Strains and stresses

ThaSH: Stress corrosion

Abstract: Lean duplex stainless steel consisting of ferrite and austenite phases has been developed in order to overcome a limited application of austenitic stainless steels in-service conditions promoting stress corrosion cracking. For this reason, the alloy has been widely employed for specific applications in various industries, such as power generation, oil & gas, etc. Due to an industrial demand for better understanding of employing lean duplex stainless steel, this study aimed to investigate hydrogen induced stress cracking behavior of UNS S32304 lean duplex stainless steel in severe aqueous environment. In the study, a CorrTest proof-ring facility was used to generate stress states on the test specimens. In order to introduce hydrogen fugacity, the cathodic charging technique was performed in 0.5M H2SO4 solution mixed with 1 g/l of NH2CSNH2 at a fixed potential of -1200 mV(Ag/AgCl). Cathodic charging durations of 5, 10 and 15 days were studied. During cathodic charging, the global stress of test specimens was kept at 86 percent of the yield strength, then stepwise increased to a given level equal to 8 percent of the yield strength in each day until rupture. The effect of cathodic pre-charging on hydrogen induced stress cracking behavior of UNS S32304 lean duplex stainless steel was presented and discussed based on the reduction of area (RA) and fractographic characteristics obtained from the test specimens.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2019

Modified: 2023-01-18

Issued: 2023-01-18

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BibliograpyCitation : ใน จุฬาลงกรณ์มหาวิทยาลัย คณะวิศวกรรมศาสตร์. การประชุมวิชาการข่ายงานวิศวกรรมอุตสาหการ ประจำปี 2562 (IE Network 2019) (pp.368-373). กรุงเทพฯ : จุฬาลงกรณ์มหาวิทยาลัย

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