Effect of Stress Waveform on Corrosion Fatigue Crack Propagation in High Strength Steels-the Role of Anodic Dissolution Mechanism

J. Ocean Eng. Technol. 1993;7(1):147-155.

고장력강의 부식피로균열전파에 미치는 하중파형의 영향과 양극용해기구의 역할

하회석,이성근

동아대학교 공과대학금속공학과,동아대학교 공과대학금속공학과

Keywords: High Strength Steel, Corrosion Fatigue, Stress Waveform, Anodic Dissolution

핵심용어: 고장력강, 부식피로, 하중파형, 양극용해

Abstract

The effect of stress waveforms on corrosin fatigue and the role of dissolution mechanism in 3NilCr steel and 20Ni maraging steel have been investigated in aerated 3% NaCl solution and synthetic seawater under sinusoidal, triangular, square, positive sawtooth, negative sawtooth, and trapezoidal stress waveforms with open circuit at frequency of 1Hz and stress ratio of 0.1. The crack growth rates under square waveform were substantially lower than under sinusoidal and triangular waveforms, but the crack growth rates under sinusoidal waveform were slightly higher under triangular waveform. For a given frequency the growth rates under the positive sawtooth waveform are higher than those under the negative sawtooth waveform. The fatigue crack growth rates of most specimens were in good agreement with the values calculated by the model based on the dissoultion mechanism.