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51316-7183-Sour Service Fatigue and Fracture Behavior of High Strength Steels

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Fatigue Crack Growth Rate (FCGR) and fracture toughness behavior of high strength steels used in drilling riser applications was investigated in sour environments. Frequency scan tests were performed were performed on X80 C110 and S135 in moderate to mildly sour environments.

Product Number: 51316-7183-SG
ISBN: 7183 2016 CP
Author: Thodla Ramgopal
Publication Date: 2016
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Fatigue Crack Growth Rate (FCGR) and fracture toughness behavior of high strength steels used in drilling riser applications was investigated in sour environments. Frequency scan tests were performed were performed on X80 C110 and S135 in moderate to mildly sour environments. Fatigue crack growth rate increased with decreasing frequency and reached a plateau value at look frequencies. The observed behavior is typical for hydrogen enhanced cracking in sour environment. At these “plateau frequencies” FCGR in the mildly sour environments were found to be about 10 to 30x higher than the in-air values. The rate controlling step for FCGR was found to be hydrogen diffusion through the fracture process zone. The critical concentration for crack advance was calculated based on a model based on hydrogen diffusion through the fracture process zone. The critical concentration of hydrogen for S-135 was significantly lower than C-110 and X-80. The critical concentration of hydrogen for crack advance for C-110 and X-80 were similar.Rising-displacement FT tests were performed in a range of environments to determine the resistance (R-curve) behavior. Tests were performed in-situ at a slow K rate of 0.05Nmm-3/2/s over a range of environmental conditions as well as microstructures namely S-135 C-110 X-80. The results show that the initiation toughness and the slope of the R-curve decreased sharply in the sour environments. A limited set of tests were performed on a 110ksi grade steel in hydrogen charged conditions to discern the effect of loading rate format and develop a mechanistic interpretation for observed J-R curve behavior.

Fatigue downloadable, Crack Growth, fracture toughness, hydrogen, sour environments, microstructure

Fatigue Crack Growth Rate (FCGR) and fracture toughness behavior of high strength steels used in drilling riser applications was investigated in sour environments. Frequency scan tests were performed were performed on X80 C110 and S135 in moderate to mildly sour environments. Fatigue crack growth rate increased with decreasing frequency and reached a plateau value at look frequencies. The observed behavior is typical for hydrogen enhanced cracking in sour environment. At these “plateau frequencies” FCGR in the mildly sour environments were found to be about 10 to 30x higher than the in-air values. The rate controlling step for FCGR was found to be hydrogen diffusion through the fracture process zone. The critical concentration for crack advance was calculated based on a model based on hydrogen diffusion through the fracture process zone. The critical concentration of hydrogen for S-135 was significantly lower than C-110 and X-80. The critical concentration of hydrogen for crack advance for C-110 and X-80 were similar.Rising-displacement FT tests were performed in a range of environments to determine the resistance (R-curve) behavior. Tests were performed in-situ at a slow K rate of 0.05Nmm-3/2/s over a range of environmental conditions as well as microstructures namely S-135 C-110 X-80. The results show that the initiation toughness and the slope of the R-curve decreased sharply in the sour environments. A limited set of tests were performed on a 110ksi grade steel in hydrogen charged conditions to discern the effect of loading rate format and develop a mechanistic interpretation for observed J-R curve behavior.

Fatigue downloadable, Crack Growth, fracture toughness, hydrogen, sour environments, microstructure

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Fatigue Crack Growth Rate Behavior of Welded Line Pipe Steel in Sour Environments

Product Number: 51317--9200-SG
ISBN: 9200 2017 CP
Author: Thodla Ramgopal
Publication Date: 2017
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Frequency scan fatigue crack growth rate tests were performed at a fixed stress intensity factor range to determine the effect of frequency in two different sour environments. Both sour environments had the same partial pressure of H2S (0.21psia) but different pH values.
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Role of Crack Tip Strain Rate on the Fatigue and Fracture Behavior of Line Pipe Steel in Sour Environments

Product Number: 51317--9203-SG
ISBN: 9203 2017 CP
Author: Thodla Ramgopal
Publication Date: 2017
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Fatigue and fracture of line pipe steels in a sour inhibited environment is presented. Fatigue crack growth rate (FCGR) was investigated as a function of frequency at several different K values at a pH of 3.5 and 0.21psia (0.00144MPa) H2S. 
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51312-01577-Effect of H2S and CO2 on Fatigue Corrosion Crack Growth and Fracture Toughness of X65 in Offshore Oi

Product Number: 51312-01577-SG
ISBN: 01577 2012 CP
Author: Feng Gui
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