scholarly journals Effect of Film-Forming Amines on the Acidic Stress-Corrosion Cracking Resistance of Steam Turbine Steel

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1628
Author(s):  
Tim De Seranno ◽  
Ellen Lambrechts ◽  
Evelyn De Meyer ◽  
Wolfgang Hater ◽  
Nathalie De Geyter ◽  
...  
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Hydrogen Uptake ◽  
Corrosion Cracking ◽  
Aqueous Environment ◽  
Extension Rate ◽  
Coated Steel ◽  
Acidic Stress ◽  
Film Forming ◽  
Turbine Steel

This work evaluates the effect of film-forming amines (FFA) on the acidic stress-corrosion cracking (SCC) resistance of NiCrMoV turbine steel. Contact angle measurements show an increased hydrophobicity of the surface when coating the steel with oleyl propylene diamine (OLDA). According to potentiodynamic measurements and post-mortem scanning electron microscopy (SEM) analysis, anodic dissolution and hydrogen embrittlement still occur when the steel is FFA coated. In situ constant extension rate testing (CERT) in acidic aqueous environment at elevated temperature of FFA-coated steel shows a ductility gain compared to non-coated steel, explained by a decrease in both corrosion rate and hydrogen uptake.

scholarly journals Stress Corrosion Cracking of Alloy 600 Using the Constant Strain Rate Test

CORROSION ◽  
1981 ◽  
Vol 37 (10) ◽  
pp. 597-607 ◽  
Author(s):  
T. S. Bulischeck ◽  
D. Van Rooyen
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Constant Strain Rate ◽  
Corrosion Cracking ◽  
Extension Rate ◽  
Alloy 600 ◽  
Steam Generator Tubing ◽  
Rate Test ◽  
Initial Results ◽  
Production Tubing

Abstract Nuclear grade production tubing of Alloy 600 was evaluated for stress corrosion cracking (SCC) susceptibility in high purity water at 365, 345, 325, and 290 C. Reverse tube U-bend specimens provided crack initiation data and constant extension rate tests were employed to determine the crack velocities experienced in the crack propagation stage. Initial results indicate that a linear extrapolation of data received from high temperature tests can be used to predict the service life of steam generator tubing that has been plastically deformed or is continually deforming by “denting.”

scholarly journals Stress Corrosion Cracking Behavior of TP 439 and 690 TT under Film-Forming Amine Environment

Scanning ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Lu Jundong ◽  
Jiang Xiaobin ◽  
Sun Ke ◽  
Liu Bin ◽  
Li Xinmin ◽  
...  
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Nuclear Power ◽  
Power Plants ◽  
Corrosion Cracking ◽  
Cracking Behavior ◽  
Film Forming ◽  
Metal Materials

Film-forming amines have been widely used in thermal power plants for maintenance after shutdown, and there are more and more applications and researches in nuclear power secondary circuits for this purpose. However, in the direction of stress corrosion cracking, there is not much research on the influence of film-forming amines on metal materials. This article uses the high temperature slow strain rate test (SSRT) method to evaluate the influence of a commercial film-forming amine on the stress corrosion cracking behavior of two conventional island materials for PWR nuclear power plants. These two metal materials are the heat exchange tube materials of the high-pressure heater and steam generator in the high-temperature operation area of the secondary circuit of a nuclear power plant: TP 439 stainless steel and 690 TT alloy. The test analyzed the mechanical properties and fracture morphology. The test results show that in the test concentration range (<5 mg/kg), the film-forming amine will not affect the SCC of TP 439 stainless steel and 690 TT alloy under the condition of slow strain rate. The behavior has a significant impact. In practical applications, the general dosage of film-forming amine is 1-2 mg/kg. This data is lower than the film-forming amine concentration used in the experiment. Therefore, there is no need to worry about the obvious impact on the SCC behavior of TP 439 stainless steel and 690 TT alloy.

scholarly journals Resistance of High-Strength Steels to Stress Corrosion Cracking Depending on External Environment pH Factor

2018 ◽  
Vol 20 (3) ◽  
pp. 19-23
Author(s):  
Petr Jonsta ◽  
Irena Vlckova ◽  
Zdenek Jonsta ◽  
Vladimir Tomasek ◽  
Tatana Fenclova
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Temper Embrittlement ◽  
Crack Tip ◽  
High Strength Steels ◽  
High Strength ◽  
Corrosion Cracking ◽  
Localized Corrosion ◽  
Aqueous Environment ◽  
Antimony Electrode

The paper deals with the study of stress corrosion cracking of high-strength steels in an aqueous environment with a varying pH factor ranging from 5.5 to 12.0. Steels were studied after quenching and tempering, one of the steels was prone to temper embrittlement. Single-edge notched pre-cracked specimens were used for the experiments. Changes in the pH factor at the crack tip were measured using an antimony electrode. The pH factor values at the crack tip dropped to 2.0. Steel prone to temper embrittlement showed significantly shorter incubation period and more accelerated development of corrosion process compared to the optimized heat treatment of the second steel. Proneness to intergranular fracture was observed close to the fatigue crack tip. The obtained results expand the existing knowledge about localized corrosion processes leading to the refinement of the stress corrosion cracking model when changing the pH factor on the crack tip.

Mechanical degradation of Fe-C-X steels by acidic stress-corrosion cracking

2020 ◽  
Vol 167 ◽  
pp. 108509 ◽  
Author(s):  
Tim De Seranno ◽  
Liese Vandewalle ◽  
Tom Depover ◽  
Arne R.D. Verliefde ◽  
Kim Verbeken
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Mechanical Degradation ◽  
Acidic Stress

Stress Corrosion Cracking Susceptibility of AISI 316 NG and 316 Stainless Steel in an Impurity Environment

CORROSION ◽  
1985 ◽  
Vol 41 (11) ◽  
pp. 630-634 ◽  
Author(s):  
P. S. Maiya ◽  
W. J. Shack
Keyword(s):  
Stainless Steel ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Dissolution Mechanism ◽  
Extension Rate ◽  
316 Stainless Steel ◽  
Dissolution Model ◽  
Relative Stress ◽  
Aisi 316

Abstract The relative stress corrosion cracking (SCC) susceptibility of heat-treated AISI 316 nuclear grade (NG) and 316 stainless steel (SS) has been investigated by means of constant extension rate tensile (CERT) tests over a range of strain rates from 10−5 to 10−7 s−1 in simulated boiling water reactor (BWR) environments that contain SO42− as an impurity. It is observed that although AISI 316 NG SS is extremely resistant to intergranular SCC (IGSCC) even when subjected to severe heat treatments, it can become susceptible to transgranular SCC (TGSCC) in the presence of impurities. Sensitized AISI 316 SS, however, is susceptible to IGSCC even in high-purity water containing 0.2 ppm O2, and the addition of an impurity aggravates the IGSCC susceptibility. The SCC results obtained for both materials are discussed in terms of a phenomenological model that incorporates a slip-dissolution mechanism and elastic-plastic fracture mechanics. The results for both IGSCC and TGSCC are demonstrated to be consistent with the slip-dissolution model of Ford.

Effect of Extension Rate on Stress Corrosion Cracking Velocity Using Electrochemical Noise Analysis

2019 ◽  
Vol 3 (24) ◽  
pp. 13-18
Author(s):  
Claudia Lopez ◽  
Citalli Gaona ◽  
Adan Borunda ◽  
Facundo Almeraya ◽  
Alberto Martinez ◽  
...  
Keyword(s):  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Electrochemical Noise ◽  
Noise Analysis ◽  
Corrosion Cracking ◽  
Extension Rate
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