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A study on the application of electrochemical method for degradation evaluation

열화평가에 전기화학적 방법의 응용에 관한 연구

  • Published : 1998.01.01

Abstract

In order to develop the evaluation methods of degradation for the Ni-Cr-Mo-V steel, which is in use for turbine rotor in nuclear power plant, the degraded materials were prepared by simulated degradation methods. The result of impact test and fatigue crack growth test shows that the FATT(Fracture Appearance Transition Temperature) and fatigue crack growth rate increased with the increase of degradation. And the result of new electrochemical polarization test method was suggested for the evaluating FATT, fatigue crack growth exponent and coefficient C values based on the results of relationship between corrosion current density(Icorr) & FATT, and the m & C and Icorr.

Keywords

Degradation;Fracture Appearance Transition Temperature(FATT);Fatigue Crack Growth Rate;Electrochemical Polarization;Corrosion Density(Icorr)