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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
A state-of-the-art survey was performed on slow strain rate (SSR) testing methods for the Materials Technology Institute of the Chemical Process Industries, Inc. (MTI). The goal of the survey was to determine if SSR testing methods yield useful data in predicting stress-corrosion cracking (SCC) susceptibility of metals used in the chemical process industry (CPI). The information was obtained by searching the literature and by sending out questionnaires to relevant sources. It was concluded that most reported cases of anomalous behavior with the SSR test technique can be attributed to inadequate control or measurement of strain rate or potential, which are the major controlling parameters for a specific material-environment combination.
A review of six years operational experience in using the slow strain test procedure has indicated several unique advantages associated with dynamic strain techniques and also identified an area of limitation.
The appearance of a minimum in the susceptibility to stress corrosion cracking (SCC)/strain-rate curves obtained by slow strain-rate experiments has been examined carefully and a relationship between the repassivation rate of the material under investigation and the position of this minimum has been established.
Slow strain-rate technique provides a rapid and reliable method to determine stress corrosion cracking (SCC) susceptibility of metals and alloys for a broad range of applications. Procedures are discussed for using the technique to (a) determine if an alloy is susceptible to SCC, (b) express SCC severity quantitatively, (c) rank alloys with respect to SCC susceptibility, and (d) evaluate the consequences of SCC susceptibility. Metallography or fractography is essential to confirm the presence or absence of SCC. Once SCC is confirmed, a number of parameters are available to express SCC severity quantitatively. Slow strain-rate technique is a conservative measure in that alloys exhibiting SCC in the test can be acceptable in service if stresses are controlled; however, no SCC in the test indicates no SCC in service under the conditions tested.