The fatigue crack growth (FCG) rates of mill annealed Alloy 600 in 0.1M NaCl solution, 25°C, were studied by a fracture mechanics test method and were affected by the applied potential, load frequency and load ratio. At an applied cathodic potential of — 1300mVSCE, the FCG rates increased with lowering the load frequency and with increasing the load ratio. The enhanced FCG rate was found in the lower load frequencies (≤ 0.1Hz) and was more significant with increasing the load ratio. The secondary cracks and transgranular fracture modes were observed on the fractured surfaces with applied cathodic potential. The possible hydrogen-assisted cracking mechanism on enhancing the FCG rates of Alloy 600 cathodically charged in 0.1M NaCl solution, 25°C, is discussed in this paper.

Subject
Test methods, Crack growth, Corrosion fatigue, Water, Secondary cracks, Cathodic potential, Tubes, Fatigue crack growth rate, Stress cracking, Sodium chloride solution, Fatigue, Alloys, Hydrogen
Keywords:
fatigue crack growth, Alloy 600, sodium chloride, cathodic potential, load frequency, load ratio, hydrogen-assisted cracking
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1995
Association for Materials Protection and Performance (AMPP)
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