scholarly journals Hydrogen-Induced Stress Corrosion Cracking of Pipe Lines of Russia

1996 ◽  
Author(s):  
Tatyana K. Sergeyeva ◽  
Igor A. Tychkin ◽  
Gennady G. Vasiliev
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Large Diameter ◽  
Corrosion Cracking ◽  
Slow Strain Rate Test ◽  
Corrosion Mechanism ◽  
Hydrogen Distribution ◽  
Induced Stress ◽  
Rate Test ◽  
Large Diameter Pipes

The results of expert studies of large diameter pipes damaged due to external stress corrosion cracking are presented in the report. These data obtained in the 1993–1995 are typical for various regions of Russia. The results of laboratory studies of the stress-corrosion mechanism for pipe steels in suspensions of soils from the places where the operating failure had occurred are given in the report also. The mechanism of hydrogen-induced stress-corrosion cracking (HISCC) realizing through local hydrogenation of steel during plastic deformation has been determined by means of the technique of slow strain rate test (SSRT) of samples in the soil under cathodic, anodic and free corrosion potentials in combination with hydrogenation and hydrogen distribution analyses along length of a sample. No hydrogenation of volumes of pipes non-subjected to cracking was observed but hydrogenation took place in the zones subjected to stress corrosion.

scholarly journals Investigation of Stress Corrosion Cracking in Magnesium Alloys by Quantitative Fractography Methods

2017 ◽  
Vol 62 (2) ◽  
pp. 557-562 ◽  
Author(s):  
M. Sozańska ◽  
A. Mościcki ◽  
B. Chmiela
Keyword(s):  
Magnesium Alloy ◽  
Fracture Surface ◽  
Strain Rate ◽  
Stress Corrosion ◽  
Quantitative Evaluation ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Slow Strain Rate Test ◽  
Rate Test ◽  
We43 Magnesium Alloy

Abstract The article shows that the use of quantitative fracture description may lead to significant progress in research on the phenomenon of stress corrosion cracking of the WE43 magnesium alloy. Tests were carried out on samples in air, and after hydrogenation in 0.1 M Na2SO4 with cathodic polarization. Fracture surfaces were analyzed after different variants of the Slow Strain Rate Test. It was demonstrated that the parameters for quantitative evaluation of fracture surface microcracks can be closely linked with the susceptibility of the WE43 magnesium alloy operating under complex state of the mechanical load in corrosive environments. The final result of the study was the determination of the quantitative relationship between Slow Strain Rate Test parameters, the mechanical properties, and the parameters of the quantitative evaluation of fracture surface (microcracks).

Stress Corrosion Cracking Behaviour of Flux Bounded TIG Welded AA2219 T87 Aluminum Alloy in 3.5 Weight Percent NaCl Solution

2015 ◽  
Vol 766-767 ◽  
pp. 733-738
Author(s):  
A.V. Santhana Babu ◽  
P.K. Giridharan ◽  
A. Venugopal ◽  
P. Ramesh Narayanan ◽  
S.V.S. Narayana Murty
Keyword(s):  
Aluminum Alloy ◽  
Strain Rate ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Weight Percent ◽  
Corrosion Cracking ◽  
Slow Strain Rate Test ◽  
Nacl Solution ◽  
Test Technique ◽  
Rate Test

Limitation in penetration depth is a concern in conventional TIG welding. To improve penetration capability of TIG process, Flux Bounded TIG (FBTIG) has been developed. Stress corrosion cracking (SCC) behavior of FBTIG welds of aluminum alloy AA 2219 T87 is evaluated in 3.5 weight percent NaCl solution using Slow Strain Rate Test technique (SSRT) as per ASTM G129. SCC index defined as the ratio of the elongation of tensile tested specimen in NaCl to that of air is taken as a measure of the susceptibility to cracking. Based on the SCC index, it is concluded that the SCC resistance of FBTIG joints are good and comparable to that of conventional TIG welds.

Study on Stress Corrosion Cracking Sensitivity of CrNiMoV Steam Turbine Rotor Steels

2019 ◽  
Vol 795 ◽  
pp. 102-108 ◽  
Author(s):  
Shu Xian Lin ◽  
Yu Hui Huang ◽  
Fu Zhen Xuan ◽  
Shan Tung Tu
Keyword(s):  
Stress Corrosion ◽  
Steam Turbine ◽  
Stress Corrosion Cracking ◽  
Turbine Rotor ◽  
Optical Microscope ◽  
Corrosion Cracking ◽  
Slow Strain Rate Test ◽  
Operation Condition ◽  
Steam Turbine Rotor ◽  
Rate Test

The stress corrosion sensitivities of 25Cr2Ni2MoV, 26NiCrMoV10-10 and 30Cr2Ni4MoV low-pressure rotor steels in simulated nuclear steam turbine operation condition were investigated by slow strain rate test (SSRT), and the stress corrosion cracking (SCC) mechanisms were studied by optical microscope (OM), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). Results revealed that the SCC sensitivity of 25Cr2Ni2MoV steel was highest in 3.5wt.%NaCl solution at 180°C, while the SCC sensitivity of 26NiCrMoV10-10 steel and 30Cr2Ni4MoV steel are similar. The SCC sensitivity of CrNiMoV steam turbine rotor steels could be decreased by the increase of Ni element and the decline of mechanical intensity. Cracks initiate from metal surface and then propagate to the inner metal, which showed a form of transgranular cracking.

Effect of Potential on Stress Corrosion Cracking of 321 Stainless Steel under Marine Environment

2015 ◽  
Vol 1090 ◽  
pp. 75-78 ◽  
Author(s):  
Xi Qing Dong ◽  
Mei Rong Li ◽  
Yan Liang Huang ◽  
Li Juan Feng ◽  
Xin Cui
Keyword(s):  
Stainless Steel ◽  
Stress Corrosion ◽  
Marine Environment ◽  
Stress Corrosion Cracking ◽  
Fracture Morphology ◽  
Corrosion Cracking ◽  
Slow Strain Rate Test ◽  
Fracture Elongation ◽  
Rate Test ◽  
Strain Stress

Slow strain rate test (SSRT) applied with different potential was adopted to investigate the stress corrosion cracking (SCC) sensibility of stainless steel under marine environment. The fracture morphology of 321 stainless steel SCC specimens were analyzed with the aid of SEM. The strain-stress results showed that 321 stainless steel exhibited less SCC sensitivity when anodic potential or cathodic potential were applied on the specimen, both fracture elongation and fracture time ascended compared with that of corrosion potential. The fractography analysis results also proved this susceptibility clearly.

Determination of Stress Corrosion Cracking Resistance of Al-Cu-Mg Alloys by Slow Strain Rate and Alternate Immersion Testing

CORROSION ◽  
1981 ◽  
Vol 37 (2) ◽  
pp. 98-103 ◽  
Author(s):  
Shantanu Maitra
Keyword(s):  
Strain Rate ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Slow Strain Rate ◽  
Test Method ◽  
Slow Strain Rate Test ◽  
Test Results ◽  
Alloy Plate ◽  
Rate Test

Abstract Increased artificial aging from the T351 temper to T851 temper is known to increase resistance to stress corrosion cracking (SCO for Al-Cu-Mg alloy 2124. A series of incrementally aged 2124 alloy plate was tested for resistance to SCC by the slow strain rate technique and by the conventional alternate immersion test method. It is shown that slow strain rate test results are in agreement with the conventional test results. Using fracture energy and other loss in ductility parameters to denote resistance to SCC, it has been shown that this technique can be used as a more accurate SCC test. SEM examinations of fracture surfaces confirm the SCC indices obtained by the slow strain rate test.

Stress Corrosion Cracking of NiTi Orthodontic Wires in Sodium Fluoride Solution

2008 ◽  
Vol 32 ◽  
pp. 79-82 ◽  
Author(s):  
Xiao Ji Li ◽  
Jian Qiu Wang ◽  
En Hou Han ◽  
Wei Ke
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Slow Strain Rate Test ◽  
Orthodontic Wires ◽  
Fluoride Solution ◽  
Rate Test ◽  
Scanning Electron

The influence of fluoride on stress corrosion cracking (SCC) of NiTi orthodontic wires was investigated using slow strain rate test (SSRT) and scanning electron microscopy (SEM). The results indicated that fluoride significantly accelerated the stress corrosion cracking of NiTi orthodontic wires. The fractographies of NiTi orthodontic wires exhibited striation pattern.

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