... Abstract This paper elaborates on a method previously reported that characterized a materials susceptibility to hydrogen embrittlement in a seawater environment under CP by monitoring the crack growth rate of ASTM (1) E1820 1 pre-cracked CT specimens at various constant stress intensity (K...

... strain rate (SSR) testing and static crack growth rate (SCGR) testing in 3.5 wt.% NaCl under cathodic protection. The susceptibility of AM 718 to hydrogen embrittlement is discussed based on the test results and metallography analysis with respect to its wrought counterpart. INTRODUCTION Alloy UNS...

... of cracks under both static and dynamic loads. Two test systems are used in atmospheric corrosion tests to continuously measure crack length and estimate crack growth rates. An instrumented double cantilever beam sample and loading fixture is used to obtain short crack measurements, and a hydraulically...

... and in sour service environments at elevated temperature and pressure (350°F/400°F and 125psia CO 2 /0.08psia H 2 S). Fatigue crack growth rate and static crack growth rate measurements were performed in both the environments. In sour environments, the alloys exhibited excellent resistant to environmentally...

... compact tension (CT) specimens in a seawater environment and under cathodic protection 2 . The procedure has been to monitor the crack growth and the crack growth rate (CGR) at various constant stress intensity and at varying cathodic protection potentials. In this way these two parameters can be seen...

... during those periods when the wellhead is connected to either the BOP stack or the tubing head spool and subsea tree. Materials in the subject assemblies may have actual yield strengths in excess of 690 N/mm 2 (100 ksi), strength levels at which published S-N and fatigue crack growth rate (FCGR) design...

.... Historically, the slow strain rate (SSR) test technique has been the main method used to evaluate the susceptibility of the carbon steel liner(s) to SCC. Recently, cyclic crack growth rate (CGR) testing has been used to complement the SSR test technique to evaluate SCC susceptibility. A test program...

... ABSTRACT Research shows that chromate can offer a large, 10 fold, reduction in corrosion fatigue crack growth rates when added to a bulk sodium chloride (NaCl) solution in high concentrations, and can inhibit corrosion fatigue when added to a bulk NaCl solution in concentrations relevant...

... network model. Corrosion fatigue experiments combined with a literature survey to determine statistically distributed crack growth rates are used to generate Paris laws that are incorporated into the model for determination of the pit-to-crack transitions and estimate the overall number of cycles...

... assessment. The embrittlement resistance in terms of crack growth rates of fracture mechanics specimens depend on the test parameters. The effects of loading rate on crack growth rate of UNS N07718 under cathodic polarization in 3.5% NaCl is shown in Figure 2. 19 It can be seen from Figure 2 that for UNS...

... Atmospheric Stress Corrosion Crack Growth Rate Analyses of Austenitic Stainless Steel B.P. Somerday Southwest Research Institute® 6220 Culebra Rd. San Antonio, TX, 78238 USA E.N. Macha Southwest Research Institute® 6220 Culebra Rd. San Antonio, TX, 78238 USA J.H. Feiger Southwest Research...

... analysis (FEA) was implemented to compute stresses in each of the components. Those stresses were then used to predict crack growth rates, evaluate the life limiting failure mechanisms associated with continued use of the steam chests, and recommend future actions. steam-assisted gravity drainage...

... 5777 Frantz Road Dublin, OH - 43017 USA ABSTRACT 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. The role...

... are solely those of the author(s) and are not necessarily endorsed by the Association. Simulation of Crack Propagation in NACE TM0177 Method D An illustration of the potentiality of the cohesive zone model is described in Figure 6. It gives the crack growth rate as function of the stress intensity factor...

.... The smooth bar SSR test is less aggressive than the N-SSR test and it is easier to detect signs of SCC visually through secondary cracking on the gage section. The SCC crack depth on the fracture surface is also used in both test methods to calculate an equivalent crack growth rate. Venkatesh et al. [9] used...

...- (corresponding to normal steam condensate chemistry). Furthermore, corrosion fatigue long crack growth rates were the same in aerated and in deaerated solutions for the two environments but stress corrosion cracks arrested in deaerated solution. An explanation for these varied results is presented based...

... Effect of Strain Rate on the Fatigue and Static Crack Growth Rate of UNS N07718 Under Cathodic Polarization Ramgopal Thodla DNV GL 5777 Frantz Road Dublin, OH - 43017 USA Brandon C. Rollins DNV GL 5777 Frantz Road Dublin, OH - 43017 USA Harrod M. Scott DNV GL 5777 Frantz Road Dublin, OH - 43017...

... Abstract Digital image correlation is an emergent strain-mapping methodology that allows full-field surface strain mapping by comparing the images of the same region before, during and after deformation. This technique has been used to explore fatigue crack growth rates and the development...

... that there is an important synergy between the crack growth rates, which affects the rate at which the crack intersects new MnS inclusions, and the crack chemistry. This creates a hysteresis in response as loading is decreased vs. increased 6 . The primary controlling parameter is the growth rate which determines the MnS...

... Abstract The effects on stress corrosion crack growth rates of Alloy X-750 of heat, microstructure, heat treatment, crack plane orientation, stress intensity factor, corrosion potential and water purity have been extensively investigated in 288 °C water. A crack growth rate database of Alloy...