Relationship between the microstructure and local corrosion properties of weld metal in austenitic stainless steels

Tokita, Shun; Kadoi, Kota; Aoki, So; Inoue, Hiroshige

doi:10.1016/j.corsci.2020.108867

Cited by 26 publications

(8 citation statements)

References 36 publications

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“…Many laboratory studies and eld investigations report that welded joints require special attention regarding the entire metal infrastructure concerning corrosive processes [10][11][12][13]. It happens since steel microstructural evolution will occur in and around the welded area during the welding process, leading to mechanical properties substantially different from those in nonwelded areas [14][15].…”

Section: Introductionmentioning

confidence: 99%

Corrosion of Weld Heat-Affected Zones Submersed in Seawater with Indigenous Microorganisms

et al. 2023

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The corrosion behaviors of different weld heat-affected zones (HAZs) were investigated, comprising an API 5L X65 steel immersed in seawater with an abundant native microbial community. Before tests, HAZ physical simulations were performed at the peak temperatures of 700°C, 860°C, 1000°C, and 1350°C. Throughout 14 days of immersion, various planktonic bacterial groups associated with microbiologically in uenced corrosion were metabolically active in the seawater. Desulfovibrio members were present in a considerable number of OTUs. Scanning electron microscopy showed an intense microbial adhesion and corrosion product deposits in all HAZ sub-regions and the control base metal coupon (BM). The electrochemical tests revealed that the corrosion behavior of all HAZ sub-regions and BM were indistinguishable. However, topography analysis showed different behaviors of pitting corrosion. The results revealed that the pitting resistance of the microstructure composed of cementite grains (700°C HAZ) was superior to that of other HAZ sub-regions. On the other hand, the microstructure composed of martensite and austenite grains (860°C HAZ) exhibited the worst pitting resistance of the weld joint, leading to a maximum pit penetration of 2.3 times greater than that pit on the BM. The changes in the HAZ sub-region sensitivity to pitting corrosion were attributed to variations in the microstructural composition.

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Section: Introductionmentioning

confidence: 99%

Corrosion of Weld Heat-Affected Zones Submersed in Seawater with Indigenous Microorganisms

et al. 2023

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“…[6][7][8][9] Recent literature suggested that the complex microstructure produced during welding results in preferential corrosion in the weld metal at alloy-depleted regions or δ/γ interfaces that leads to failure of components in several industries. [10][11][12][13] The presence of nitrogen even in minor amounts can affect the properties of SSs. The beneficial effect of nitrogen alloying in SS is a remarkable increase in strength and toughness, and excellent corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

“…[ 6–9 ] Recent literature suggested that the complex microstructure produced during welding results in preferential corrosion in the weld metal at alloy‐depleted regions or δ/γ interfaces that leads to failure of components in several industries. [ 10–13 ]…”

Section: Introductionmentioning

confidence: 99%

Some aspects of pitting corrosion susceptibility of As‐welded and thermally aged nitrogen‐alloyed 316SS weld metal

Mannepalli

Shankar

Ningshen

et al. 2022

Materials & Corrosion

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Type 316N (0.07% N) stainless-steel welds prepared by shielded metal arc welding were evaluated for their pitting corrosion susceptibility in an acidified chloride environment and a neutral chloride environment in as-welded and thermally aged conditions at 823 and 923 K for 4, 10, 24, and 100 h. After 100 h thermal aging at 823 K, 46% of δ ferrite was transformed into carbide and 81% δ ferrite was transformed into carbide and sigma phases at 923 K for 100 h. On thermal aging at 823 K (0-10 h) and 923 K (10-100 h), the changes in the degree of alloy depletion (DOA) and pitting potential were marginal due to the presence of nitrogen. Thermally aged samples at 823 K beyond 24 h showed a significant decrease in pitting potential in acidic and neutral chloride media, whereas at 923 K, the pitting potential decreased significantly up to 10 h. The results of DOA and passive current density from the double-loop electrochemical potentiokinetic reactivation (DLEPR) test and the electrochemical reactivation test (ERT) correlated well with the observed secondary phases.The role of alloy depletion in terms of the parameters DLEPR, ERT, microstructure, and nitrogen alloying on pitting corrosion is discussed.

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“…Decheng Kong et al [16] emphasized that there was a lower passive film thickness and corrosion potential for the 316L stainless steel specimens after recrystallization heat treatment, and they also noted that the protective potential decreased with the increasing heat treatment temperature and time. Tokita et al [17] reported the relationship between the microstructure and local corrosion properties of weld metal in austenitic stainless steel.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical behavior of AISI 302 austenitic stainless steel in coal chemical high‐salt wastewater

Yang

Wang

Ren

et al. 2021

Materials & Corrosion

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In this study, the effect of grain size and grain boundary characteristic distribution on the corrosion resistance of AISI 302 austenitic stainless steel in simulated coal chemical high-salt wastewater was evaluated by electrochemical impedance spectroscopy and potentiodynamic polarization measurements. The grain size of the heat-treated sample is significantly increased and contains a greater fraction of high-angle grain boundaries (HAGBs) and twin content. As the heat treatment temperature and time increase, the passivation current density increases, which makes the passive film more susceptible to attack. The coarse-grained microstructure has exhibited worse pitting resistance due to its higher fraction of the HAGBs.

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Relationship between the microstructure and local corrosion properties of weld metal in austenitic stainless steels

Cited by 26 publications

References 36 publications

Corrosion of Weld Heat-Affected Zones Submersed in Seawater with Indigenous Microorganisms

Corrosion of Weld Heat-Affected Zones Submersed in Seawater with Indigenous Microorganisms

Some aspects of pitting corrosion susceptibility of As‐welded and thermally aged nitrogen‐alloyed 316SS weld metal

Electrochemical behavior of AISI 302 austenitic stainless steel in coal chemical high‐salt wastewater

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