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Process and mechanism of fracture in a pipeline material in chloride and sulphide environments

✍ Scribed by A.N. Kumar; R.K. Pandey

Publisher: Elsevier Science
Year: 1985
Tongue: English
Weight: 747 KB
Volume: 22
Category: Article
ISSN: 0013-7944
DOI: 10.1016/0013-7944(85)90126-2

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✦ Synopsis

The kinetics and mechanism of subcritical cracking in a hot rolled microalloyed steel have been investigated in presence of 3.5% NaCl and H2S impregnated acetic acid solutions. The J-integral parameter is used to determine the threshold J tscc and terminal Jtr values analogus to KIJfc and KIf. HIS environment appears to be more aggressive than the NaCl medium where considerable amount of energy dissipation occurs during the cracking process. Joining of tine cracks, resulting from blistering of pits/voids is responsible for subcritical cracking under H2S medium, while the process of environmental cracking under NaCl medium occurs mainly by the growth of pits to link up in the direction of stressing.

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