Morphology of localized attack on the compression side of 3 1/2% Ni U-bend specimen in 0.5% acetic acid saturated with H22S at 0.1 MPa, balance N2 (PT = 1 atm). Magnification 200X.
Dunlop, A. K. Stress corrosion cracking of low strength, low alloy nickel steels in sulfide environments. Corrosion 34, 88-96 (1978).