Metallurgical, Fatigue and Pitting Corrosion Behavior of AISI 316 Joints Welded with Nb-Based Stabilized Steel Filler

Malhotra, Dikshant; Shahi, A. S.

doi:10.1007/s11661-019-05623-0

Cited by 20 publications

(17 citation statements)

References 32 publications

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“…Further, the intensity of both these peaks was relatively small in case of remelted 316L clad in the aged condition indicating the tendency of suppression of Cr carbides, which could be attributed to dissolution of Cr carbide precipitates owing to surface remelting of clad surfaces. Similar locations for the formation of γ, δ ferrite phases along with Cr and Mo carbide precipitates were observed by Dikshant and Shahi [21] in conventional and Nb-stabilized AISI 316L-welded joints.…”

Section: Metallurgical and Corrosion Characterization Of Weldssupporting

confidence: 82%

“…Higher passive current densities are known for accelerated precipitation kinetics and increased dissolution of the passive films formed on stainless steels. [ 21,23 ] The cladded surfaces remelted using GTAW process showed higher Epit value and reduced mean passive current density relative to conventional 316L clads in the AW condition. A similar trend was observed at aged conditions despite an increase in their pitting corrosion susceptibility.…”

Section: Resultsmentioning

confidence: 99%

“…This decomposition of δ ferrite at the aged condition occurs owing to thermally active diffusion processes. [ 21 ] Higher δ ferrite content traps sulfur content in austenitic stainless steels, thereby reducing the MnS inclusion density at γ /δ boundaries and in the γ matrix that improves the pitting corrosion resistance. The XRD patterns (Figure 3a,b) show austenite ( γ ) and δ ferrite phases besides other precipitates in the AW and the aged condition for different clads.…”

Section: Resultsmentioning

confidence: 99%

“…A similar procedure has been demonstrated by authors in previous work on AISI‐316 stainless steel‐welded joints. [ 21 ] After anodic polarization, cladded surfaces with electrochemically formed passive films were extracted from electrochemical cells, rinsed in distilled water, dried, and placed in vacuum chamber for XPS measurements. Argon ion sputtering was done to yield depth profiles.…”

Section: Methodsmentioning

confidence: 99%

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Effect of GTAW remelting on the corrosion performance of AISI 316L cladding

Malhotra

Shahi

Gupta

2020

Materials & Corrosion

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Gas tungsten arc welding (GTAW) process was used for remelting of the top clad layers of austenitic stainless steel 316L deposited on low‐carbon steel using gas metal arc welding (GMAW) process. Different electrochemical techniques were used for assessing and comparing sensitization and pitting corrosion performance of these clads (both in the as‐welded as well as aged condition), besides comparing their passive film characteristics. Top clad layer remelting was influential upto a penetration depth of around 2.34 mm. Aging of clads at 750°C/24 hr accelerated the precipitation of carbides, which suppressed partially due to their remelting as indicated by electron probe microanalysis studies. Due to this GTAW remelted clads exhibited a relatively lesser degree of sensitization and higher pitting corrosion resistance as compared to the conventional GMAW clads. X‐ray photoelectron spectroscopy studies revealed a relatively higher concentration of O, Cr, Ni, and Mo in the passive film of remelted clad surfaces than the conventional ones, which accounted for enhanced protectiveness of passive film on remelted surfaces as indicated by electrochemical impedance spectroscopy studies.

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Section: Metallurgical and Corrosion Characterization Of Weldssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Effect of GTAW remelting on the corrosion performance of AISI 316L cladding

Malhotra

Shahi

Gupta

2020

Materials & Corrosion

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“…Figure 15 b shows micro dimples due to plastic deformation which is the evidence for higher energy absorption before failure. Images also displayed elongated voids bordered with the fibrous network which are phenomena for representing strengthening characteristics, as reported by Malhotra et al [ 26 ]. Robert et al [ 27 ] who studied the CT austenitic stainless steel fracture behavior has stated that the fracture path is mixed, through inter and intra particles and in the same area very different behaviors can coexist.…”

Section: Tensile Test Digital Image Correlation Fractography Ansupporting

confidence: 70%

Digital Image Correlation of Tensile Properties for Monel 400/SS 316L Dissimilar Metal Welding Joints

et al. 2021

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Dissimilar metal weld joints of Monel 400 and Stainless Steel 316L stainless steel were carried out using Gas Tungsten Arc Welding (GTAW). Conventional annealing and cryogenic treatment were performed on the welded joints. Weld joints of this combination of materials have enormous potential applications in power industry and the available related literature is limited. In the present study, the tensile properties of heat treated (HT), cryotreated (CT), and untreated (UT) specimens were studied. The engineering stress and strain were determined experimentally as per Standard Test Methods for Tension Testing of Metallic Materials (ASTM E8). The strain distribution was evaluated at different zones of weld joint was evaluated using Digital Image Correlation (DIC). Significant difference was noticed between the zones. Weld zone of all samples had less local stress and strain and SS 316L heat affected zone (HAZ) zone had more local stress and strain when compared to other zones. The local strain distribution along distance from weld center line and local stress-strain curves of different zones are also predicted. Scanning Electron Microscopy was used to analyze the fracture behavior of welded samples for HT, CT, and UT specimens.

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Understanding the role of Ti addition on the corrosion and passive film characteristics of Nb stabilized AISI 347 weld

Malhotra

Shahi

2022

Materials & Corrosion

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A multipass multilayer weld pad was fabricated on AISI 347 base metal with filler combinations of AISI 321 and AISI 347, to understand the role of Ti addition on metallurgical, corrosion, and passive film characteristics of the AISI 347 weld. Weld layers with Nb content of 0.53 wt.%, 0.47 wt.%, 0.23 wt.% and Ti of 0 wt.%, 0.21 wt.%, 0.33 wt.%, respectively, were extracted from fabricated weld pad. Selected weld metal compositions were subjected to thermal aging at 750°C for 24 h to investigate the influence of varying precipitation induced in these welds. Ti addition in AISI 347 weld showed lower enrichment of C and Cr at dendritic regions resulting in reduced Cr depletion, lower sensitization, enhanced pitting potential, and repassivation ability compared to conventional Nb stabilized AISI 347 weld. Passive film characteristics studied by electrochemical impedance spectroscopy and X‐ray photoelectron spectroscopy depicted formation of more protective, and dense passive film with higher Cr, Ni, and O concentrations for Ti added AISI 347 weld relative to conventional ones. Therefore, Ti addition via the use of Ti stabilized filler in the Nb stabilized AISI 347 weld proved to be efficient in enhancing its corrosion performance by forming a more protective passive oxide film.

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Metallurgical, Fatigue and Pitting Corrosion Behavior of AISI 316 Joints Welded with Nb-Based Stabilized Steel Filler

Cited by 20 publications

References 32 publications

Effect of GTAW remelting on the corrosion performance of AISI 316L cladding

Effect of GTAW remelting on the corrosion performance of AISI 316L cladding

Digital Image Correlation of Tensile Properties for Monel 400/SS 316L Dissimilar Metal Welding Joints

Understanding the role of Ti addition on the corrosion and passive film characteristics of Nb stabilized AISI 347 weld

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