Study of the stress corrosion cracking of low-carbon low-alloy steels using the eddy current method

2019 ◽  
Vol 85 (3) ◽  
pp. 52-58
Author(s):  
E. N. Butusova ◽  
V. V. Mishakin
Keyword(s):  
Stress Corrosion ◽  
Eddy Current ◽  
Stress Corrosion Cracking ◽  
Current Method ◽  
Corrosion Cracking ◽  
Low Alloy Steels ◽  
Low Carbon ◽  
Eddy Current Method ◽  
Alloy Steels

Estimate of early stages of destruction during stress corrosion cracking of pipe steels by eddy current method

2020 ◽  
pp. 154-162
Author(s):  
Ye. N. Butusova ◽  
V. V. Mishakin
Keyword(s):  
Stress Corrosion ◽  
Eddy Current ◽  
Stress Corrosion Cracking ◽  
Current Method ◽  
Corrosion Cracking ◽  
Calculation Error ◽  
Low Carbon ◽  
Eddy Current Method ◽  
Fine Structures ◽  
The Moment

The paper studies stress corrosion cracking (SCC) of low carbon low alloyed steels. It is shown that the use of eddy current method allows us to evaluate modifications of fine structures associated with the processes of initiation and growth of stress corrosion cracks. The dependences of the incubation time on the value of the macroelasticity limit σ0 are given. It is noted that the increase in the value of σ0 leads to an increase in the time before the initiation of the first crack. This can be explained: the limit of macroelasticity determines the beginning of microplastic flow in the material. On the basis of experimental data, the analytical dependence of the incubation period of the SCC on the value of the macroelasticity limit is obtained. The calculation error did not exceed 10%. A parameter is proposed for assessing the state of the material subject to SCC. It allows recording the passage of the stages of accumulation of micro-damages and the moment of exhaustion of a significant part of the material resource before the appearance of multiple surface macro-cracks according to the data of eddy current measurements.

Evaluation of susceptibility to stress corrosion cracking based on non-linear eddy current method

2010 ◽  
Vol 33 (3-4) ◽  
pp. 1303-1308 ◽  
Author(s):  
Ryota Oikawa ◽  
Tetsuya Uchimoto ◽  
Toshiyuki Takagi ◽  
Ryoichi Urayama ◽  
Yoshiyuki Nemoto ◽  
...  
Keyword(s):  
Stress Corrosion ◽  
Eddy Current ◽  
Stress Corrosion Cracking ◽  
Current Method ◽  
Corrosion Cracking ◽  
Eddy Current Method ◽  
Non Linear

Intergranular microchemistry and stress corrosion cracking

1981 ◽  
Vol 377 (1771) ◽  
pp. 477-501 ◽  
Keyword(s):  
Grain Boundary ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Nitrate Solution ◽  
Corrosion Cracking ◽  
Low Alloy Steels ◽  
Intergranular Stress Corrosion ◽  
Oxidation Potentials ◽  
Alloy Steels ◽  
Impurity Elements

An important contributory role of grain boundary segregation of residual impurities in the intergranular stress-corrosion cracking of carbon and low alloy steels is proposed. Experimental results are presented of the stress corrosion susceptibility of mild steel in nitrate solution, and in relation to varying grain boundary composition as monitored by Auger electron spectroscopy. The harmfulness of a particular impurity element depends on three factors: its bulk level; its segregation thermodynamics and kinetics resulting in an equilibrium enrichment at the grain boundaries; and its ability to promote electrochemical dissolution of the grain boundary. A hierarchy of impurity elements that exacerbate stress corrosion cracking is presented and correlated with equilibrium oxidation potentials. The results and simple model allow the prediction of the relative harmfulness of impurity elements with respect to intergranular stress corrosion in commercial carbon and low alloy steels from a knowledge of the bulk concentration only. This enables significant improvements in performance to be designed in the alloy by respecifying lower levels of only the one or two highly detrimental impurities.

Mechanism of Stress Corrosion Cracking of Low Alloy Steel in Water

CORROSION ◽  
1981 ◽  
Vol 37 (6) ◽  
pp. 320-327 ◽  
Author(s):  
Wu-Yang Chu ◽  
Tian-Hua Liu ◽  
Chi-Mei Hsiao ◽  
Shi-Qun Li
Keyword(s):  
Plastic Deformation ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Cathodic Polarization ◽  
Optical Microscope ◽  
Corrosion Cracking ◽  
Low Alloy Steels ◽  
Wide Range ◽  
Alloy Steels ◽  
Loaded Crack

Abstract For four low alloy steels with a wide range of tensile strengths, the dynamical processes of the nucleation and propagation of stress corrosion cracking (SCC) in water with various polarization conditions and in a inhibitor solution were traced with an optical microscope. The results show that if the tensile strength of the steel is higher than a critical value, which is different in the different polarization conditions, and KI>KISCC, the plastic zone in front of a loaded crack tip is enlarged with time, i.e., the delayed plastic deformation occurs in all the environments used. The nucleation and propagation of SCC will follow when this delayed plastic deformation develops to a critical condition. Neither anodic and cathodic polarization nor the inhibitor can change the feature of the delayed plasticity and the nucleation and propagation of SCC in water. In all the environments used, the KISCC is increased and da/dt is decreased with decreasing strength of the steel. Anodic polarization and the addition of the inhibitor make KISCC increase and da/dt decrease. But cathodic polarization is just opposite.

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