Effects of applied potential on the fatigue behavior of Alloy 600 in sodium chloride solution

Book · Fri Sep 01 04:00:00 EDT 1995

OSTI ID:99557

Ho, J T; Yu, G P ^[1]

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1. National Tsing-Hua Univ., Hsinchu (Taiwan, Province of China). Dept. of Nuclear Engineering

The fatigue crack growth (FCG) rates of mill annealed Alloy 600 in 0.1 M 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 {minus}1,300mV{sub SCE}, 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 ({<=}< 0.1 Hz) 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 0.1 M NaCl solution, 25 C, is discussed in this paper. This study is pertinent to the fatigue cracking problems occurring in steam generator tubes of PWR.

• OSTI ID: 99557
• Report Number(s): CONF-950304--
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
36 MATERIALS SCIENCE
CORROSION FATIGUE
CORROSIVE EFFECTS
CRACK PROPAGATION
ELECTRIC POTENTIAL
EXPERIMENTAL DATA
INCONEL 600
PWR TYPE REACTORS
SODIUM CHLORIDES
STEAM GENERATORS
TUBES