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Atmospheric Stress Corrosion Crack Growth Rate Analyses of Austenitic Stainless Steel

Picture for Atmospheric Stress Corrosion Crack Growth Rate Analyses of Austenitic Stainless Steel
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Chloride induced stress corrosion cracking (CISCC) is a significant problem. The objective of the work described in this paper was to further the understanding of atmospheric crack growth rate of stainless steel in a chloride-rich environment.

Product Number: 51317--9408-SG
ISBN: 9408 2017 CP
Author: Brian Somerday
Publication Date: 2017
Industries: Materials Selection and Design , Science of Corrosion
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Chloride induced stress corrosion cracking (CISCC) is a significant problem that has been observed to lead to premature failure of components at various facilities. CISCC can occur when airborne salts deposit and deliquesce on the surface of equipment. The deliquescence of these salts in a humid environment creates a chloride-rich brine. The presence of this brine along with a residual tensile stress could lead to CISCC. There has been much work demonstrating conditions where CISCC can initiate but there is very little information on the actual SCC crack growth rate (CGR) under an atmospheric environment.The limited amount of atmospheric SCC CGR measurements have been obtained either from operating experience or by a few labs. The objective of the work described in this paper was to further the understanding of atmospheric CGR of stainless steel in a chloride-rich environment. Simulated sea salt was deposited on the surface of the stainless steel sample and exposed to varying RH to understand how CGR changes in a given atmospheric environment. Results indicate that the SCC CGR of 304L stainless steel is dependent not only on the RH value but is also dependent upon the RH rate of change with time which has not been observed previously. This paper examines some preliminary tests that elucidate some interesting features about the CGR of austenitic steel under an atmospheric exposure.

Key words: atmospheric, stress, corrosion cracking

Chloride induced stress corrosion cracking (CISCC) is a significant problem that has been observed to lead to premature failure of components at various facilities. CISCC can occur when airborne salts deposit and deliquesce on the surface of equipment. The deliquescence of these salts in a humid environment creates a chloride-rich brine. The presence of this brine along with a residual tensile stress could lead to CISCC. There has been much work demonstrating conditions where CISCC can initiate but there is very little information on the actual SCC crack growth rate (CGR) under an atmospheric environment.The limited amount of atmospheric SCC CGR measurements have been obtained either from operating experience or by a few labs. The objective of the work described in this paper was to further the understanding of atmospheric CGR of stainless steel in a chloride-rich environment. Simulated sea salt was deposited on the surface of the stainless steel sample and exposed to varying RH to understand how CGR changes in a given atmospheric environment. Results indicate that the SCC CGR of 304L stainless steel is dependent not only on the RH value but is also dependent upon the RH rate of change with time which has not been observed previously. This paper examines some preliminary tests that elucidate some interesting features about the CGR of austenitic steel under an atmospheric exposure.

Key words: atmospheric, stress, corrosion cracking

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