Stress corrosion test specimens

S tandard Practicefor Making and Using U-Bend Stress—Corrosion Test Specimens, ASTM G 30-84, American Society for Testing and Materials, Philadelphia, Pa., 1992. 

Fig. 8.89 Stressing systems for stress-corrosion test specimens (a)-(O constant strain, (g) constant load...

Practice for making and using U-bend stress corrosion test specimens Recommended practice for laboratory immersion corrosion testing of metals Method for vibratory cavitation erosion test Practice for recording data from atmospheric corrosion tests of metallic-coated steel specimens... 

Recommended practice for examination and evaluation of pitting corrosion Test method for determining susceptibility to stress corrosion cracking of high-strength aluminium alloy products Test method for pitting and crevice corrosion resistance of stainless steels and related alloys by the use of ferric chloride solution Recommended practice for preparation and use of direct tension stress corrosion test specimens... 

G49, Standard Practice for Preparation and Use of Direct Tension Stress-Corrosion Test Specimens, ASTM, West Conshohoken, PA, 1995. 

Fig. 9.2 C rings used in constant deformation tests [11], Reprinted, with permission, from ASTM G 38-01 Standard Practice for Making and Using C-Ring Stress-Corrosion Test Specimens, copyright ASTM international West Conshohocken, PA.

ASTM G30-79 (1984) Standard Practice for Making and Using U-Bend Stress Corrosion Test-Specimens. 

G38 Practice for Making and Using C-Ring Stress—Corrosion Test Specimens... 

G 58 Practice for the Preparation of Stress-Corrosion Test Specimens for Weldments... 

ASTM G 30, Practice for Making and Using U-Bend Stress-Corrosion Test Specimens— This describes methods for constructing specimens for evaluating SCC of metals. This standard includes specimen orientation, dimensions. 

ASTM G 39, Practice for Preparation and Use of Bent-Beam Stress-Corrosion Test Specimens— This describes methods for design, preparation, and use of bent-beam stress-corrosion specimens. This standard covers apparatus for supporting specimens, basic design of a specimen, stress calculations, test conditions, exposure, and inspection techniques. 

ASTM G 49, Recommended Practice for Preparation and Use of Direct Tension Stress-Corrosion Test Specimens— This presents the design, preparation, and use of ASTM standard tension test specimens for investigating susceptibiUty to SCC. Specimens are generally tested in a selected environment imder axial load conditions until fracture occurs. This standard describes the apparatus for providing the load to the stressed specimens along with exposure considerations and inspection methods. 

ASTM G 58, Practice for Preparation of Stress Corrosion Test Specimens for Weldments— This covers the manufacture and application of welded test specimens in stress corrosion testing. This practice is used to evaluate a total weldment, weld metal, or presence of notches and stress risers in weldments with respect to SCC in an environment. In addition, ASTM G 58 contains a method for evaluating the critical stress levels that will produce SCC in a weldment. The specimens are evaluated after exposure to an environment by microscopic methods. This standard includes typical specimens (stressed and tension), welding considerations, test specimen preparation, and inspection after exposure. 

This is a difficult phenomenon to monitor online. Mostly investigations are carried out over relatively long-term exposure of stressed corrosion test specimens. Slow strain rate tests that are carried out in laboratory evaluations are difficult to reproduce in the field environment. Techniques such as acoustic emission have been used on-line to detect process conditions that produce SCC, but the data analysis is stiD relatively lengthy, complex, and in the developmental stage. 

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