Abstract
The fatigue crack growth rate of Inconel 600 is affected by applied potential, test frequency, and prior thermal treatment. At an applied cathodic potential of -700 mV (SCE), in IN H2SO4, a decrease in test frequency produces an increase in crack growth,da/dN, while a thermal treatment of 700 °C for 0.5 h or more produces intergranular fracture at lowA.K. Intergranular cracking of annealed samples is observed only after precharging with cathodically produced hydrogen. The enhanced FCG rate and tendency for intergranular cracking are mutually exclusive effects in that test frequencies between 1 and 10 Hz do not affect fracture mode, and thermal treatment at 700 °C for 0.5 to 100 h does not affect crack growth rate. It is suggested that since both effects are observed only at cathodic potentials, the data support a hydrogen embrittlement mechanism.
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G. S. WAS, formerly Research Assistant, Nuclear Engineering Dept., Massachusetts Institute of Technology
formerly Postdoctoral Associate, Department of Materials Science and Engineering, Massachusetts Institute of Technology
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Was, G.S., Tischner, H.H., Latanision, R.M. et al. Fatigue crack growth behavior of inconel 600 at cathodic potentials. Metall Trans A 12, 1409–1418 (1981). https://doi.org/10.1007/BF02643685
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DOI: https://doi.org/10.1007/BF02643685