A New Evaluation Procedure for Detecting the Material Degradation of a CrMoV Turbine Rotor Steel

Youshoa Lu, Tetsuo Shoji, Hideaki Takahashi

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

A CrMoV turbine rotor retired after long service operation (22 years at 500°) was investigated to characterize the material degradation due to temper embrittlement by use of three different kinds of techniques; the electrochemical polarization curve (EPC) method, the electrochemical noise analysis (ENA) and the small punch (SP) test. Grain boundary embrittlement due to phosphorous segregation can be detected as a change in repassivation behavior in the EPC method; a significant difference in corrosion potential fluctuation in ENA; and a shift of SP transition temperature. Diagrams for evaluating the temper embrittlement of a CrMoV turbine rotor were also proposed. Furthermore, a realistic and rational procedure for evaluating material degradation during service operation has been also discussed by combined EPC, ENA and SP methods.

Original languageEnglish
Pages (from-to)1550-1557
Number of pages8
JournalTransactions of the Japan Society of Mechanical Engineers Series A
Volume53
Issue number492
DOIs
Publication statusPublished - 1987

Keywords

  • Electrochemical Technique
  • Material Degradation
  • Nondestructive Evaluation (NDE)
  • Small Punch Test
  • Temper Embrittlement
  • Turbine Rotor

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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