Abstract
The near-threshold fatigue crack growth behavior of 403 stainless steel has been investigated in low O2 steam (<1 ppm), high O2 steam (40 ppm), and boiling water with various concentrations of NaCl and Na2SO4 at a test frequency of 160 Hz. High O2 steam tends to increase the crack propagation rates in the threshold region, relative to low O2 steam. Values of threshold stress intensity range, ΔKth, slightly increase with an increase in the concentration of NaCl in the solution. During threshold crack growth, the percentage of intergranularity decreases with a decrease inAK. Varying pH from 5.0 to 10.0 in a 0.1 gm NaCl plus 1.0 gm Na2SO4 per 100 ml H2O solution does not affect the rates of near-threshold crack propagation. However, increasing the hydrazine level from 30 to 107 ppb in the same salt solution enhances the resistance to crack growth while reducing the percentage of intergranular fracture to nearly zero.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
