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This paper describes slow strain-rate test equipment, operable at elevated temperatures and pressures, that includes electrochemical potential control capability. Applications in caustic stress corrosion cracking (SCC) studies of both nuclear steam generator and fossil boiler materials are presented. Electrochemical potential regions for stress corrosion cracking of Inconel alloy 600, Incoloy alloy 800, and Type 304 stainless steel are compared to results obtained using constant load specimens. Tests with titanium stabilized Alloy 800 (Sanicro 30) tubular specimens also demonstrate the effect of potential on cracking mode. A comparison of SCC test results, using both long term exposure tests and short term straining electrode tests, is made between a mild steel and its weld metal. In these examples, favorable comparisons are obtained with tests using conventional methods, proving the value and usefulness of the slow straining device in accelerating SCC studies and in defining more accurately conditions under which SCC can occur.
In order to predict when and how a material will crack under environmental conditions, engineers used to subject it to pressure for a long time, up to a year in cases; about 20 years ago, a testing method was developed that slowly but inexorably increases the pressure, which seems to cut down the ti
Slow strain-rate technique has been used extensively in the study of stress corrosion cracking (SCC) of pipeline steel. Results were obtained to guide development and evaluation of SCC control methods and to study the SCC process. Application of the slow strain-rate technique led to determination of the specific environment of practical importance, identification of effective SCC inhibitors, determination of critical potential range for SCC, increased awareness of the major role of strain rate in the SCC process, and development of coatings incorporating SCC inhibitors.