Microstructure evolution during low-strain thermo-mechanical processing and its repercussion on intergranular corrosion in alloy 600H

Kaithwas, C.K.; Bhuyan, P.; Pradhan, S.K.; Mandal, Sumantra

doi:10.1016/j.matchar.2018.09.019

Cited by 31 publications

(8 citation statements)

References 52 publications

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“…Based on the above experimental results, the main corrosion types of the aged alloy are intergranular and pitting corrosion [ 64 ]. Intergranular corrosion is likely to occur in under-aged alloys, while the pitting corrosion likely appears in over-aged alloys.…”

Section: Resultsmentioning

confidence: 99%

Effects of Aging Treatment on Corrosion Behavior of a Tensile Deformed Al-Cu-Mn-Fe-Zr Alloy in 3.5% NaCl Solution

et al. 2021

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In this paper, the effects of an aging treatment on the corrosion resistance/mechanism of a tensile deformed Al-Cu-Mn-Fe-Zr alloy are investigated. The impedance magnitude and polarization resistance increase, while the corrosion current decreases with the increased aging time and temperature. The discontinuously-distributed precipitates and precipitation-free zone, which can cut the corrosion channels, appear at grain boundaries when the temperature is relatively high and the aging time is relatively long. They can improve the corrosion resistance. Additionally, the intergranular and pitting corrosion are the main mechanisms. The intergranular corrosion is likely to occur in an under-aged alloy. This is because the potential difference between the grain boundaries and grains is high, due to the segregation of Cu atoms. When the aging degree is increased, the grain boundary precipitates reduce the potential difference, and the intragranular precipitates make the surrounding matrix prone to dissolution. As such, the pitting corrosion is likely to occur in the over-aged alloys.

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Section: Resultsmentioning

confidence: 99%

Effects of Aging Treatment on Corrosion Behavior of a Tensile Deformed Al-Cu-Mn-Fe-Zr Alloy in 3.5% NaCl Solution

et al. 2021

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“…Alloy 600H having a chemical composition of Ni–16.4Cr–8.2Fe–0.07 C (in wt.%), was considered for this work. The detailed chemical composition of the studied alloy has been provided in Kaithwas et al [ 16 ] The alloy was obtained in the solution annealed (at 1403 K for 1 h) followed by water‐quenched condition and hereafter considered as “as‐received” specimen (abbreviated as AR) in this study. To attain grain size variation, thermal and thermo‐mechanical treatment schedules were judiciously designed so that any significant changes in other microstructural features, viz.…”

Section: Methodsmentioning

confidence: 99%

On the role of grain size variation on pitting corrosion and passive film behavior of Alloy 600H

Kaithwas

Bairi

Mozumder

et al. 2023

Materials & Corrosion

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In this work, the effect of grain size variation on the pitting corrosion as well as the passivation behavior of the Alloy 600H has been critically assessed by various electrochemical techniques. The grain size modifications have been achieved by a series of thermal and thermo-mechanical processing. The potentiodynamic polarization study has revealed that the coarse-grained specimens exhibit higher corrosion and pitting resistance than the fine-grained ones. This has been attributed to the greater extent of random high-angle grain boundary (RHAGB) surface area in the fine-grained specimens, which acted as favorable locations for pit initiation. The electrochemical impedance spectroscopy (EIS) result has indicated the formation of more imperfect (nonstoichiometric) passive layers in fine-grained specimens due to the predominant presence of high energy and defective RHAGBs surface. Moreover, the Mott-Schottky analysis has revealed that the fine-grained specimens generate higher defect densities at the interfaces, which leads to passive film instability due to increased mobility of cation interstitial and cation vacancies at the interfaces.

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“…Many researchers have contributed toward the understanding of sensitization of stainless steels that led to IGC and IGSCC-related corrosion issues. Furthermore, many studies have also devoted to studying different factors such as deformation [7,[11][12][13][14][15][16], grain size [17,18], grain misorientation [10,19], GB character [20][21][22], which affect sensitization kinetics. It is understood that invariably cold working cannot be avoided, and a certain amount of plastic strain is always present in the steels due to manufacturing activities.…”

Section: Sensitization: the Understandings And Current Developmentsmentioning

confidence: 99%

“…These emerging techniques are discussed separately in this manuscript. These are: (1) addition of oversize solute atoms [55], (2) altering grain boundary nature and connectivity [20,21,34], (3) populating highdensity twinning [36,37], and (4) through providing a nearboundary gradient zone (NBGZ) [10,28].…”

Section: Solution Annealingmentioning

confidence: 99%

Sensitization of Austenitic Stainless Steels: Current Developments, Trends, and Future Directions

Srinivasan

2021

Metallogr. Microstruct. Anal.

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In this manuscript, the latest developments pertaining to sensitization are discussed. Sensitization leads to intergranular corrosion and intergranular stress corrosion cracking. The advantages and disadvantages of conventional methods to combat sensitization are elaborated. Emerging/newer techniques such as grain boundary engineering, creation of orientation gradients, and high density of twinning to improve resistance to sensitization are also covered. Detection and monitoring of deleterious phase precipitation such as carbides, nitrides, and other intermetallic phases during operation necessitate making use of nondestructive testing (NDT) methods. Possible information that we get from NDT is for material characterization includes the size, shape, and location of a defect. Herein, the significant developments for monitoring and detection of phases concerning sensitization by NDT are discussed. These range from magnetic methods to ultrasonic techniques. The multi-physics approach is essential to fully utilize NDT to ensure/predict the lifetime of the components used in the industry. Further, proper selection of suitable NDT for defect detection can avert accidents, catastrophic failures, and economic losses due to corrosion degradation. For this, the corrosion engineer/corrosionist properly apply the suitable techniques (prevention, monitoring, and assessment) to address the issues of sensitization among the wide choice available.

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Microstructure evolution during low-strain thermo-mechanical processing and its repercussion on intergranular corrosion in alloy 600H

Cited by 31 publications

References 52 publications

Effects of Aging Treatment on Corrosion Behavior of a Tensile Deformed Al-Cu-Mn-Fe-Zr Alloy in 3.5% NaCl Solution

Effects of Aging Treatment on Corrosion Behavior of a Tensile Deformed Al-Cu-Mn-Fe-Zr Alloy in 3.5% NaCl Solution

On the role of grain size variation on pitting corrosion and passive film behavior of Alloy 600H

Sensitization of Austenitic Stainless Steels: Current Developments, Trends, and Future Directions

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