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51312-01477-Environmental Effects on Fatigue Crack Growth Rates in Sour Environments

Picture for Environmental Effects on Fatigue Crack Growth Rates in Sour Environments
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Product Number: 51312-01477-SG
ISBN: 01477 2012 CP
Author: Ramgopal Thodla
Publication Date: 2012
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Corrosion fatigue of C-Mn steels is a hydrogen controlled phenomenon and is borne out by the significant experimental evidence which indicates an increase in FCGR with decreasing frequency. There is some amount of published data that has been generated under range of different conditions on X60/X65 and even X80. There has been significant data has been generated under differing conditions of DK Kmax R ratio’s and environmental conditions. There are several possible hypothesis for the rate controlling step in the propagation of corrosion fatigue cracks in sour environments: a) Presence of pre-soaked diffusible hydrogen in the metal b) Cracktip reactions generating hydrogen c) Combination of both a and b A set of experiments were performed to evaluate the effect of environmental variables of interest in particular pH and pH2S. The role of pre-charged hydrogen on FCGR was quantified by comparing data from tests in which samples were uncoated as opposed to coated samples. Crack tip chemistries were also measured under these conditions to determine the contribution of crack tip environments to the FCGR process. The role of internal hydrogen versus crack tip hydrogen in the FCGR process will also be discussed based on critical experiments performed.
Corrosion fatigue of C-Mn steels is a hydrogen controlled phenomenon and is borne out by the significant experimental evidence which indicates an increase in FCGR with decreasing frequency. There is some amount of published data that has been generated under range of different conditions on X60/X65 and even X80. There has been significant data has been generated under differing conditions of DK Kmax R ratio’s and environmental conditions. There are several possible hypothesis for the rate controlling step in the propagation of corrosion fatigue cracks in sour environments: a) Presence of pre-soaked diffusible hydrogen in the metal b) Cracktip reactions generating hydrogen c) Combination of both a and b A set of experiments were performed to evaluate the effect of environmental variables of interest in particular pH and pH2S. The role of pre-charged hydrogen on FCGR was quantified by comparing data from tests in which samples were uncoated as opposed to coated samples. Crack tip chemistries were also measured under these conditions to determine the contribution of crack tip environments to the FCGR process. The role of internal hydrogen versus crack tip hydrogen in the FCGR process will also be discussed based on critical experiments performed.
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Picture for Fatigue Crack Growth Rate Behavior of Welded Line Pipe Steel in Sour Environments
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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. 
Picture for Effect of H2S and CO2 on Fatigue Corrosion Crack Growth and Fracture Toughness of X65 in Offshore Oi
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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
Publication Date: 2012
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