RS. Ondrejcin
Published: 1979
Total Pages: 19
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A rapid electrochemical tension test was developed for evaluating stress corrosion crack initiation in carbon steel. Constant anodic current was imposed on smooth-bar tension specimens as the specimens were slowly strained to fracture at 1.3 x 10-6/s. Equivalent results were obtained for the following ductility properties measured: uniform elongation, total elongation, and reduction of area. Total elongation was chosen as the index for stress corrosion crack initiation. An equation was developed that allowed calculation of total elongation of specimens in electrolytes (test solutions) with composition ranges of 1.5 to 5.5 M nitrate, 0 to 3.5 M nitrite, and 0 to 5.0 M hydroxide, and a temperature range of 50 to 100°C. A minimum of 13 percent total elongation was selected to indicate the possible initiation of cracking in A 285-B steel alloy.