SYMPOSIA PAPER Published: 01 January 1993
STP12718S

Electrochemical Evaluation of Thermal Aging Embrittlement of 2 1/4Cr-1Mo Steel for a Nuclear Pressure Vessel

Source

A nondestructive test technique using an electrochemical method was investigated for evaluating thermal aging embrittlement of 21/4Cr-lMo steel for a nuclear pressure vessel. Agings were conducted at temperatures ranging from 400 to 500°C for up to 50 000 h. In the anodic polarization curve measured in calcium nitrate solution, a secondary peak, which is higher for embrittled materials than for the deembrittled ones, was observed in the passive potential region. Changes in the secondary peak can be correlated with the degree of the embrittlement evaluated by the shift in Charpy ductile-to-brittle transition temperature (ΔDBTT).

Author Information

Nishiyama, Y
Japan Atomic Energy Research Institute, Ibaraki-ken, Japan
Fukaya, K
Japan Atomic Energy Research Institute, Ibaraki-ken, Japan
Suzuki, M
Japan Atomic Energy Research Institute, Ibaraki-ken, Japan
Eto, M
Japan Atomic Energy Research Institute, Ibaraki-ken, Japan
Shoji, T
Research Institute for Fracture Technology, Tohoku University, Sendai, Japan
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Details
Developed by Committee: E10
Pages: 16–26
DOI: 10.1520/STP12718S
ISBN-EB: 978-0-8031-5250-2
ISBN-13: 978-0-8031-1869-0