Influence of laser surface melting condition on intergranular corrosion resistance in type 316 stainless steel

Kenji Muto, Masahide Furukawa, Ju N.Ichi Sakai, Makoto Yoshida

Research output: Contribution to journalArticle

Abstract

When stainless steels are sensitized, intergranular corrosion resistance decreases and sensitization is assumed to be one of the causes of stress corrosion cracking under severe environment in nuclear reactors. For various stainless steels, Laser surface melting (LSM) with CO 2 laser have been reported. In this study YAG laser that is able to transmit energy with the optical fiber is used. Influence of LSM condition on intergranular corrosion resistance was examined. Experimental results indicated that by LSM sensitized Type 316 stainless steel restored intergranular corrosion resistance as the material after solution treatment. Moreover, The material that sensitized in low temperature (LTS) 500°C for 24 hours after LSM exhibited the same degree of intergranular corrosion resistance as the material after solution treatment. This would be caused by lower δ ferrite volume fraction in the solidified microstructure after LSM than that in arc welding metal.

Original languageEnglish
Pages (from-to)340-345
Number of pages6
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume73
Issue number5
DOIs
Publication statusPublished - 2009 May 1

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Keywords

  • Laser surface melting
  • Low temperature sensitization (lts)
  • Re-sensitization
  • Sensitization
  • Type 316 stainless steel
  • Yttrium aluminum garnet (yag) laser

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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