Effect of buffer-layered buttering on microstructure and mechanical properties of dissimilar metal weld joints for nuclear plant application

Rathod, Dinesh W.; Singh, Pavan Kumar; Pandey, Sunil; Aravindan, S.

doi:10.1016/j.msea.2016.04.053

Cited by 52 publications

(15 citation statements)

References 28 publications

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“…The buttering procedure employed manually in both processes. The low dilution of Ni-Fe alloy with ferritic steel substrate in buffer layer due to GTAW process can ensure the resulting weld chemistry of Ni-Fe matrix in order to attain reduced diffusivity of carbon in Ni-matrix [1,2] and graded composition [17,19] in dissimilar welds. The process parameters used for buttering procedure to employ buffer and buttering layers are given in Table 2.…”

Section: Methodsmentioning

confidence: 99%

“…Unfortunately, the carbon diffusion is not completely arrested yet using Ni-base fillers [1,6,8,[10][11][12][13][14][15] as the significant amount of carbide formers (Cr, Nb, Ti) exists in Inconel 82/182 fillers [11,13,14,16,17]. Effect of carbide formers in buttering using Inconel 82 fillers for the carbon diffusion and metallurgical deterioration has been investigated in previous study [16] using buffer layer (Ni-Fe alloy) free of carbide formers adjacent to ferritic steel.…”

Section: Introductionmentioning

confidence: 99%

“…Subsequent buttering on buffer layer was made with low heat input gas metal arc welding (GMAW) [16]. Presence of carbide formers in considerable fractions in Inconel 82/182 buttering adjacent to SA508Gr.3cl.1 cannot ascertain the complete holdup to carbon diffusion [1,6,8,11,15,17] and subsequent metallurgical deterioration [18] in terms of martensite and undesirable phase formation. Therefore, the effect of graded composition [16,17,19] using Ni-Fe alloy as intermediate buffer layer on ferritic steel with subsequent buttering using shielded metal arc welding (SMAW) was investigated.…”

Section: Introductionmentioning

confidence: 99%

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Diffusion Control and Metallurgical Behavior of Successive Buttering on SA508 Steel Using Ni–Fe Alloy and Inconel 182

Rathod

Pandey

Aravindan

et al. 2016

Metallogr. Microstruct. Anal.

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The metallurgical deterioration and carbon diffusion caused during welding in the vicinity of the fusion interfaces between dissimilar metals have been investigated in case of gas tungsten arc and shielded metal arc welded SA508Gr.3Cl.1 steel substrate with Ni-Fe alloy and Inconel 182. The study was conducted to investigate the effect of Ni-Fe matrix as buffer layer and SMAW process for buttering deposition on the carbon diffusion and metallurgical changes. Quantitative measurement and validation of carbon/alloying elements distribution in as-welded, thermally aged, and postweld heat-treated conditions were performed in buttering deposits by using optical emission spectrometry and electron probe microanalysis. The extent of carbon diffusion has been estimated using Groube's diffusion couple and confirmed with microstructure microhardness and X-ray diffraction. Martensite formation has been estimated for its thickness and validated with metallurgical properties. The effect of buffer layer is significant for carbon diffusion and tempering of martensite with thermal aging, PWHT, and multipass deposition. The concentration and activity gradient of carbon has been established due to Ni-Fe matrix as buffer layer and higher dilution for buttering. The obtained results are confirming the control of carbon diffusion and lesser metallurgical deterioration in suggested buttering procedure.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diffusion Control and Metallurgical Behavior of Successive Buttering on SA508 Steel Using Ni–Fe Alloy and Inconel 182

Rathod

Pandey

Aravindan

et al. 2016

Metallogr. Microstruct. Anal.

Self Cite

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“…Especially, redistribution of residual stress should be paid attention to during welding of buttering layer [14]. In addition, Rathod et al [15] studied the influence of the buttering layer on the tensile, impact toughness and fracture toughness properties of the DMWJ in nuclear power, and found that the properties were superior of welded joint using buttering layer. It was instrumental in reducing residual stress, controlling carbon migration, and obtaining equivalent fatigue performance compared to the welded joint of without buttering layer [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

High cycle fatigue behavior of a dissimilar metal welded joint in ultra-supercritical steam turbine rotor

Wang

Zhu

et al. 2020

Mater. Res. Express

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The high cycle fatigue (HCF) property and microstructure of a dissimilar metal welded joint (DMWJ) for ultra-supercritical steam turbine rotor were systematically investigated in this paper. The DMWJ was fabricated using narrow gap submerged arc welding (NG-SAW) technique with buttering layer. Conditional fatigue strength of 30Cr1Mo1V (BM-1), buttering layer (BL), weld metal (WM) and 30Cr2Ni4MoV (BM-2) based on S-N curve was obtained by HCF tests at room temperature. The microstructure and second-phase carbide as well as fracture appearance of BM-1, BL, WM and BM-2 were characterized by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscope (TEM). The results show that the BL has lower fatigue strength, which are related to more content of the soft ferrite and less content of the hard carbide. The acicular ferrite represents better fatigue properties than massive ferrite due to barrier effect. Additionally, dislocation density sharply increases near the carbides, grain boundaries, and lath structures resulting in dislocation tangle after HCF test, which helps to improve the fatigue strength of the welded joint. The carbide precipitated, aggregated, and grown in the grain boundaries promoted crack nucleation, reduced the crack propagation rate and affected the crack propagation path.

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“…These have used high-strength low-alloy (HSLA) steels, for example 8630 and F22, which receive buttering weld multipasses with Ni-based weld metal (e.g. alloy 625 and 725) 14,15,2 . In view of the need to meet the hardness criteria of 22HRC or 250HV10 specified by NACE MR0175 / ISO 151567 16 for the heat-affected zone (HAZ), the welded material is subjected to a post weld heat treatment (PWHT).…”

Section: Introductionmentioning

confidence: 99%

Butter-weld Interface Microstructural Analysis Employing NCS and LAMS Sections

et al. 2019

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The formation of brittle microstructures around the fusion line in dissimilar welds has required a deeper microstructural analysis in this region. The study becomes more relevant when these welds are used in environments that facilitate hydrogen embrittlement. The present work aims to characterize the microstructure and hardness at the diluted zone interface in joints welded with dissimilar materials. Aiming for a better efficacy in the microstructural characterization of this zone, samples of both normal cross-section (NCS) and section with slope were used, according to the low-angle microsectioning (LAMS) technique, which allows a greater amplification of partially mixed zones (PMZs). The results indicated the diffusion of carbon from the heat-affected zone (HAZ) towards the fusion line which, in combination with other alloying elements, form highly brittle carbides. In turn, the hardness of the base metal and the HAZ was reduced after post weld heat treatment, whereas in the weld metal an opposite behavior was observed. The dissimilar interface was promising for applications in environments facilitating hydrogen embrittlement, especially regarding the characteristics of zone Φ.

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Effect of buffer-layered buttering on microstructure and mechanical properties of dissimilar metal weld joints for nuclear plant application

Cited by 52 publications

References 28 publications

Diffusion Control and Metallurgical Behavior of Successive Buttering on SA508 Steel Using Ni–Fe Alloy and Inconel 182

Diffusion Control and Metallurgical Behavior of Successive Buttering on SA508 Steel Using Ni–Fe Alloy and Inconel 182

High cycle fatigue behavior of a dissimilar metal welded joint in ultra-supercritical steam turbine rotor

Butter-weld Interface Microstructural Analysis Employing NCS and LAMS Sections

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