Effects of Sigma Phase on the Embrittlement Behavior of Super Duplex Stainless Steel F55 under SSRT with a Cathodic Charge

• Shimada Yusuke

  Graduate School of Materials Science and Engineering, Toyama University

• Hatakeyama Masahiko

  Graduate School of Materials Science and Engineering, Toyama University

• Hirabayashi Jyunichi

  Pacific Steel Mfg. Co., Ltd.

• Yamamoto Yuichi

  Pacific Steel Mfg. Co., Ltd.

• Sato Koichi

  Graduate School of Science and Engineering, Kagoshima University

• Sunada Satoshi

  Graduate School of Materials Science and Engineering, Toyama University

Abstract

In order to clarify the influence of sigma phase and hydrogen embrittlement on the mechanical properties of newly developed super duplex stainless steel F55, SSRT was conducted while performing cathodic charge. The installation potential of the constant potential SSRT was determined by polarization curve measurement. Based on the results obtained from polarization curve measurements, SSRT’s were conducted in the air, in corrosive solution, at +0.5 V constant potential, and at −0.5 V (vs. Ag/AgCl) constant potential. In order to observe the relationship between the test environment and the fracture mode, the fracture surface was observed with a scanning electron microscope and the influence of the σ phase on hydrogen embrittlement was examined. Hydrogen embrittlement was observed regardless of the amount of σ phase. As specimen having a σ phase area ratio of 30% showed larger embrittlement caused by the σ phase in air, it was suggested that σ phase embrittlement controls an embrittlement behavior. Enhancement of hydrogen embrittlement by σ phase precipitations was not observed in a cathodic charge condition used in this experiment.

Journal

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 60 (11), 2378-2386, 2019-11-01

  The Japan Institute of Metals and Materials

Keywords

• super duplex stainless steel
• sigma phase
• hydrogen embrittlement
• SSRT
• cathodic charge

Details

• CRID: 1390564227327415168
• NII Article ID: 130007733047
• NII Book ID: AA1151294X
• DOI: 10.2320/matertrans.mt-maw2019006
• ISSN: 13475320
• ISSN: 13459678
• NDL BIB ID: 030034974
• Web Site: http://id.ndl.go.jp/bib/030034974
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I030034974
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/60/11/60_MT-MAW2019006/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed