ASTM G Standard Practice for Making and Using C-Ring Stress-Corrosion Test Specimens. ASTM G(). Standard Practice for Making and Using C-Ring Stress- Corrosion Test Specimens. standard by ASTM International. Find the most up-to-date version of ASTM G38 at Engineering
|Published (Last):||24 October 2005|
|PDF File Size:||1.33 Mb|
|ePub File Size:||16.66 Mb|
|Price:||Free* [*Free Regsitration Required]|
SCC is the brittle cracking of a metal due to the result of combined effects from localized corrosion and tensile stress. Stress Corrosion Cracking of Stainless Steel. Astn example shown indicates many intersecting, branched cracks with a transgranular propagation mode.
ASTM G38 – Standard Practice for Making and Using C-Ring Stress-Corrosion Test Specimens
These are typical of stress corrosion cracking SCC in austenitic stainless steel. In this case, however, the alloy was reported to be resistant to SCC in the NaCl brine service environment.
The location of cracking was limited to a region covered by an elastomeric sleeve. Under the sleeve, evidence of severe general and pitting corrosion were found and evidence of sulfur-containing corrosion products.
Analysis of the elastomer indicate that it was not the correct grade and chemical degradation had occurred in service to produce organic acids and sulfur compounds. This local environment resulted in enhanced localized susceptibility of the material to pitting corrosion and SCC.
Prevention or Remedial Action. In many cases, SCC involves the combination of tensile stress and local anodic attack which dictate the period of incubation prior to the initiation of SCC. Therefore, to conduct tests for SCC, either mechanical or electrochemical means are often utilized to promote localized corrosion so that the inherent susceptibility of the material can be determined.
Such techniques include the use of slow strain rate, cyclic slow strain rate, fracture mechanics and electrochemical potential control. In some cases, where constant load tests wstm used, environmental cracks can initiate but not propagate through the entire cross-section of the specimen.
Therefore, the specimen may not fail, but significant cracking may take place. Stress Corrosion Cracking Stress Corrosion Testing Description SCC is the brittle cracking of a metal due to the result of combined effects from localized corrosion and tensile stress.
ASTM G38 – 01 Standard Practice for Making and Using C-Ring Stress-Corrosion Test Specimens
Stress Corrosion Cracking of Gg38 Steel – The example shown indicates many intersecting, branched cracks with a transgranular propagation mode. Prevention or Remedial Action lower either applied or residual tensile stresses.
ASTM G – practice for preparation and use of bent-beam scc test specimens. ASTM G – practice for evaluation of scc resistance of metals and alloys in 3. ASTM G – practice for preparation and use of direct tension scc test specimens. ASTM G f38 practice for preparation of scc test specimens for weldments.
ASTM D steels caustic. ASTM F titanium aircraft engine cleaning materials.