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 language | English |
|---|---|
| Pages (from-to) | 1550-1557 |
| Number of pages | 8 |
| Journal | Transactions of the Japan Society of Mechanical Engineers Series A |
| Volume | 53 |
| Issue number | 492 |
| DOIs | |
| Publication status | Published - 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