Material Characterization Procedure of Degradation of Austenitic Stainless Steels by Use of Small Punch Test and Electrochemical Potentiokinetic Reactivation (EPR) Method

Yousao Lu, Tetsuo Shoji, Hideaki Takahashi, Yoshihisa Saito

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The fracture toughness of austenitic stainless steels decreases so drastically after 5~10 years long time service operation at the temperature of 550~850°C due to grain boundary embrittlement. In this study, therefore, an appropriate NDE procedure of the material characterization of SUS 316H and SUS 321H used as boiler superheater tubes was developed by means of Small Punch test and EPR method. A significant transition behavior from ductile to brittle intergranular fracture was observed in SP energy for the degraded materials, whereas no DBTT for the nondegraded ones. Moreover EPR method was applied to detect the grain boundary embrittlement due to sensitization or σ phase formation in austenite stainless steel. The relation between the material degradation and EPR results was also obtained. Based upon these experimental calibrations of material degradation and NDE parameters, a realistic periodic NDE procedure for austenitic stainless boiler tubes has been proposed.

Original languageEnglish
Pages (from-to)296-302
Number of pages7
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume36
Issue number402
DOIs
Publication statusPublished - 1987

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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