Hydrogen Embrittlement Behavior of Ultrahigh Strength Mooring Chain Steel Evaluated by the Slow Strain Rate Test

2019 ◽  
pp. 2705-2713
Author(s):  
Songjie Li ◽  
Keyword(s):  
Hydrogen Embrittlement ◽  
Strain Rate ◽  
Slow Strain Rate ◽  
Slow Strain Rate Test ◽  
Ultrahigh Strength ◽  
Rate Test ◽  
Mooring Chain

The study of hydrogen embrittlement of 12Cr2Mo1R(H) steel by slow strain rate test with in situ hydrogen charging

2019 ◽  
Vol 66 (5) ◽  
pp. 556-564
Author(s):  
Kun Zhang ◽  
Yicheng Fan ◽  
Xiaowei Luo ◽  
Xiaolang Chen ◽  
Chaolei Ban ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hydrogen Embrittlement ◽  
Strain Rate ◽  
Slow Strain Rate ◽  
Slow Strain Rate Test ◽  
Strain Rates ◽  
Content Type ◽  
Hydrogen Charging ◽  
Rate Test

Purpose 12Cr2Mo1R(H) steel is commonly used to make hot-wall hydrogenation reactors given its excellent mechanical properties and hydrogen embrittlement (HE) resistance. Longtime exposure to high-pressure hydrogen at medium temperature would still severely damage the mechanical properties of the Cr-Mo steel with surface HICs caused by hydrogen adsorption and hydrogen uptake. The mechanisms of HE remain controversial and have not been fully understood so far. Design/methodology/approach The HE of the steel was investigated by slow strain rate test at different strain rates with in situ hydrogen charging. The diffusion coefficient of hydrogen in the steel is measured by electrochemical technology of hydrogen permeation. HIC cracks of the fractured specimens were captured with field emission SEM equipped with an electron backscatter diffraction system. Findings Results showed that the hydrogen led to the plasticity of the samples reduced significantly, together with the distinct work hardening behavior induced by hydrogen charging during plastic flow stage. The fracture of in situ charged sample changes from quasi-cleavage to intergranular fracture with the decreasing of strain rates, which indicates that the steel become more susceptible to hydrogen. High densities of dislocations and deformation are found around the crack, where grains are highly sensitive to HIC. Grains with different Taylor factor are more susceptible to intergranular crack. Originality/value The results of the study would be helpful to a safer application of the steel.

Hydrogen Embrittlement of Low Carbon HSLA Steel during Slow Strain Rate Test

2011 ◽  
Vol 197-198 ◽  
pp. 642-645
Author(s):  
Jing Wei Zhao ◽  
Young Soo Chun ◽  
Chong Soo Lee
Keyword(s):  
Hydrogen Embrittlement ◽  
Strain Rate ◽  
Hydrogen Content ◽  
Hsla Steel ◽  
Peak Stress ◽  
Slow Strain Rate ◽  
Slow Strain Rate Test ◽  
Low Carbon ◽  
Diffusible Hydrogen ◽  
Rate Test

The hydrogen embrittlement of a low carbon HSLA steel has been investigated by means of slow strain rate test (SSRT) on circumferentially notched specimens. Hydrogen was introduced into specimens by electrochemical charging and the diffusible hydrogen content was measured by thermal desorption spectrometry (TDS) analysis. The activation energy of hydrogen desorption in the present steel was calculated to be 12.75 kJ/mol after TDS analysis. The peak stress and displacement during notch tensile tests had been found to decrease simultaneously with diffusible hydrogen content, which could be expressed by two power law relationships, respectively. Fracture surface was a cleavage type indicating that the steel had high susceptibility of hydrogen embrittlement.

scholarly journals Hydrogen Embrittlement Evaluation of Micro Alloyed Steels by Means of J-Integral Curve

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1843 ◽  
Author(s):  
Marina Cabrini ◽  
Ennio Sinigaglia ◽  
Carlo Spinelli ◽  
Marco Tarenzi ◽  
Cristian Testa ◽  
...  
Keyword(s):  
Hydrogen Embrittlement ◽  
Strain Rate ◽  
Crack Propagation Rate ◽  
Propagation Rate ◽  
Slow Strain Rate ◽  
Slow Strain Rate Test ◽  
Integral Parameter ◽  
Hydrogen Effect ◽  
J Integral ◽  
Pipeline Steels

The aim of this work is the evaluation of the hydrogen effect on the J-integral parameter. It is well-known that the micro alloyed steels are affected by Hydrogen Embrittlement phenomena only when they are subjected at the same time to plastic deformation and hydrogen evolution at their surface. Previous works have pointed out the absence of Hydrogen Embrittlement effects on pipeline steels cathodically protected under static load conditions. On the contrary, in slow strain rate tests it is possible to observe the effect of the imposed potential and the strain rate on the hydrogen embrittlement steel behavior only after the necking of the specimens. J vs. Δa curves were measured on different pipeline steels in air and in aerated NaCl 3.5 g/L solution at free corrosion potential or under cathodic polarization at −1.05 and −2 V vs. SCE. The area under the J vs. Δa curves and the maximum crack propagation rate were taken into account. These parameters were compared with the ratio between the reduction of area in environment and in air obtained by slow strain rate test in the same environmental conditions and used to rank the different steels.

Hydrogen analysis and slow strain rate test in Ar gas for irradiated austenitic stainless steel

2001 ◽  
Vol 294 (3) ◽  
pp. 241-249 ◽  
Author(s):  
J Morisawa ◽  
M Kodama ◽  
N Yokota ◽  
K Nakata ◽  
K Fukuya ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Strain Rate ◽  
Slow Strain Rate ◽  
Slow Strain Rate Test ◽  
Hydrogen Analysis ◽  
Rate Test ◽  
Ar Gas

Application of Visual Basic in Fluctuant Slow Strain Rate Test

2014 ◽  
Vol 556-562 ◽  
pp. 3291-3294 ◽  
Author(s):  
Qi Lei Sun ◽  
Lu Dan Shi ◽  
Ze Rui Liu
Keyword(s):  
Strain Rate ◽  
Corrosion Test ◽  
Pipeline Steel ◽  
Visual Basic ◽  
Slow Strain Rate ◽  
Language Design ◽  
Slow Strain Rate Test ◽  
Language Program ◽  
Natural Gas Pipeline ◽  
Rate Test

With the example of stress corrosion test of natural gas pipeline steel, the application of Visual Basic (VB) language program in the test will be discussed in the paper. The result shows that different waveforms of VB language design can simulate various forms of applied load of pipeline steel well, and make fluctuant slow strain rate test more accurate and convenient.

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.

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