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Evaluation of Simulated Corrosion Pits in X65 Steel

Picture for Evaluation of Simulated Corrosion Pits in X65 Steel
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Aims to evaluate stress and strain around a pit and to determine the relationship between plastic zone size and pit geometry using the Finite Element Method (FEM). A database containing the relationship of pit parameters and plastic zone size can provide an understanding of the risk of through-wall failure in X65 steel. 

 

Product Number: 51317--9338-SG
ISBN: 9338 2017 CP
Author: Farnoosh Farhad
Publication Date: 2017
Industry: Science of Corrosion
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$20.00
$20.00

Pitting corrosion is an insidious form of localized damage that may lead to through-wall failure and loss of containment in vessels and pipelines either directly through corrosion or indirectly following a pit-to-crack transitional stage. As such pitting corrosion is a safety environmental and economic concern for many industries. Within the oil and gas sector X65 steel is commonly used for the conveyance of production fluids. While it is known that this material grade is susceptible to pitting and cracking in several media a fundamental understanding of the pit-to-crack evolution is still not available. The growth of pits is known to be a non-linear stage in the fatigue lifetime and the developing plastic deformation can be an important factor in the pit growth regime. Consequently there is a need to study the relationship of the plastic zone size and pit geometry/size. This work aims to evaluate the stress and strain around the pit and also to determine the relationship between plastic zone size and pit geometry using the Finite Element Method (FEM). The production of a database containing the relationship of pit parameters and plastic zone size has the potential to provide a more informed understanding of the risk of through-wall failure in X65 steel as initiated by pitting corrosion.KEYWORDS: Pitting corrosion FEA Stress Concentration Factor plastic deformation X65 Steel.

Keywords: pitting corrosion, FEA, plastic deformation, X65 Steel

Pitting corrosion is an insidious form of localized damage that may lead to through-wall failure and loss of containment in vessels and pipelines either directly through corrosion or indirectly following a pit-to-crack transitional stage. As such pitting corrosion is a safety environmental and economic concern for many industries. Within the oil and gas sector X65 steel is commonly used for the conveyance of production fluids. While it is known that this material grade is susceptible to pitting and cracking in several media a fundamental understanding of the pit-to-crack evolution is still not available. The growth of pits is known to be a non-linear stage in the fatigue lifetime and the developing plastic deformation can be an important factor in the pit growth regime. Consequently there is a need to study the relationship of the plastic zone size and pit geometry/size. This work aims to evaluate the stress and strain around the pit and also to determine the relationship between plastic zone size and pit geometry using the Finite Element Method (FEM). The production of a database containing the relationship of pit parameters and plastic zone size has the potential to provide a more informed understanding of the risk of through-wall failure in X65 steel as initiated by pitting corrosion.KEYWORDS: Pitting corrosion FEA Stress Concentration Factor plastic deformation X65 Steel.

Keywords: pitting corrosion, FEA, plastic deformation, X65 Steel

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