TY - JOUR
T1 - A New Evaluation Procedure for Detecting the Material Degradation of a CrMoV Turbine Rotor Steel
AU - Lu, Youshoa
AU - Shoji, Tetsuo
AU - Takahashi, Hideaki
N1 - Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.
PY - 1987
Y1 - 1987
N2 - 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.
AB - 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.
KW - Electrochemical Technique
KW - Material Degradation
KW - Nondestructive Evaluation (NDE)
KW - Small Punch Test
KW - Temper Embrittlement
KW - Turbine Rotor
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U2 - 10.1299/kikaia.53.1550
DO - 10.1299/kikaia.53.1550
M3 - Article
AN - SCOPUS:0023396523
VL - 53
SP - 1550
EP - 1557
JO - Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
JF - Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
SN - 0387-5008
IS - 492
ER -