Enhancement of mechanical properties through modified post-weld heat treatment processes of T91 and Super304H dissimilar welded joint

Kumar, Ranjeet; Varma, Anand; Kumar, Yatindra; Neelakantan, Suresh; Jain, Jayant

doi:10.1016/j.jmapro.2022.04.008

Cited by 23 publications

(9 citation statements)

References 35 publications

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“…The EDS of the particles showed the Cr, Ti, and Nb as major elements which confirmed the possible phase of M 23 C 6 , NbC, and Ti(C, N). Kumar et al [ 71 ] have also observed the poor impact toughness of ERNiCr-3 filler weld for dissimilar metal weld of T91 and SS304H and NbC and TiC in weld metal were considered as the possible cause of poor impact toughness.…”

Section: Resultsmentioning

confidence: 99%

P92 steel and inconel 617 alloy welds joint produced using ERNiCr-3 filler with GTAW process: Solidification mechanism, microstructure, mechanical properties and residual stresses

Kumar,

Pandey,

Sirohi

et al. 2023

Heliyon

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Section: Resultsmentioning

confidence: 99%

P92 steel and inconel 617 alloy welds joint produced using ERNiCr-3 filler with GTAW process: Solidification mechanism, microstructure, mechanical properties and residual stresses

Kumar,

Pandey,

Sirohi

et al. 2023

Heliyon

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“…In high-temperature gas-cooled reactors, the superheater section is made of 800H alloy while the evaporator section is made of low-alloy ferritic steel, and there are DMWs between them. In addition, DMWs are also widely used in welding rotors [ 6 ], reheaters [ 7 ], steam tubes [ 8 ], and other high-temperature applications [ 9 ] in power plants. For the above DMWs, the austenitic steel or nickel-based alloy side is generally reliable, and DMW service life is mainly affected by the ferritic steel side with relatively poor performance [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution at Ni/Fe Interface in Dissimilar Metal Weld between Ferritic Steel and Austenitic Stainless Steel

Li,

Nie,

Wang

et al. 2023

Materials

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The formation and evolution of microstructures at the Ni/Fe interface in dissimilar metal weld (DMW) between ferritic steel and austenitic stainless steel were investigated. Layered martensitic structures were noted at the nickel-based weld metal/12Cr2MoWVTiB steel interface after welding and post-weld heat treatment (PWHT). The formation of the interfacial martensite layer during welding was clarified and its evolution during PWHT was discussed by means of scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), electron probe microanalysis (EPMA), focused ion beam (FIB), transmission electron microscopy (TEM), energy dispersive X-ray (EDX), transmission kikuchi diffraction (TKD), phase diagrams, and theoretical analysis. In as-welded DMW, the Ni/Fe interface structures consisted of the BCC quenched martensite layer and the FCC partially mixed zone (PMZ), which was the result of inhomogeneous solid phase transformation due to the chemical composition gradient. During the PWHT process, the BCC interfacial microstructure further evolved to a double-layered structure of tempered martensite and quenched martensite newly formed by local re-austenitization and austenite–martensite transformation. These types of martensitic structures induced inhomogeneous hardness distribution near the Ni/Fe interface, aggravating the mismatch of interfacial mechanical properties, which was a potential factor contributing to the degradation and failure of DMW.

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“…However, the higher hot cracking tendency of the Inconel 82 filler was reported by Naffakh et al 24 in their study on evaluating the hot cracking tendency of the different filler metals for dissimilar material weld of Inconel 657 and AISI 310 ASS. To enhance the mechanical properties of the T91 and Super304H dissimilar weldments, a modified heat treatment procedure referred to as post-weld normalizing tempering (PWNT) has been proposed by Kumar et al 25 The welded joint was produced using the GTAW process with ERNiCr-3 filler. Significant enhanced mechanical properties were obtained after PWNT; however, ERNiCr-3 filler weld microstructure remains unaffected.…”

Section: Introductionmentioning

confidence: 99%

Residual stress analysis, microstructural characterization, and mechanical properties of tungsten inert gas-welded P92/AISI 304L dissimilar steel joints

Dak

Pandey

2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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In the present work, the creep strength-enhanced ferritic martensitic P92 steel was welded with 304L austenitic stainless steel. The dissimilar joining of these two different grades of material was performed by using tungsten inert gas welding process. The nickel-based ERNiCr-3 welding consumable was used. The influence of post-weld heat treatment (760 °C, 2h), called as tempering, was also investigated. The secondary electron and optical image confirmed that ERNiCr-3 weld metal is accompanied by an equiaxed austenitic microstructure with Ni weight percentage of 68.29%. The energy-dispersive X-ray spectroscopy and electron probe microanalyzer results of the weld fusion zone revealed the Nb, Cr, and Ti segregation in the inter-dendritic region. The elemental mapping of the carbon-depleted zone, and the interface was performed using an electron probe microanalyzer, which revealed the diffusion of Ni, Cr, and Fe across the interface of P92 steel and ERNiCr-3 filler weld. The tensile test result indicated that part of the dissimilar weld joints (DWJs) with relatively weak ultimate tensile strength was ERNiCr-3 weld metal. The ultimate tensile strength value of the DWJs was observed as 610 MPa and 580 MPa in the as-weld and post-weld heat treatment situations, respectively. The Charpy V-notch impact energy of the ERNiCr-3 weld fusion zone was achieved as 135 ± 2 J and 140 ± 2 J in as-weld and post-weld heat treatment situations, respectively. The low impact toughness of the ERNiCr-3 weld metal was attributed to the presence of niobium carbide (NbC) and titanium carbide (TiC) particles. The peak longitudinal residual stress of 490 MPa and transverse residual stress of 442 MPa were noted in the ERNiCr-3 weld fusion zone at a depth of 3 mm from the top surface. The tempering heat treatment exhibited a significant drop in the residual stresses value for the weld fusion zone and heat affected zone (HAZ).

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Enhancement of mechanical properties through modified post-weld heat treatment processes of T91 and Super304H dissimilar welded joint

Cited by 23 publications

References 35 publications

P92 steel and inconel 617 alloy welds joint produced using ERNiCr-3 filler with GTAW process: Solidification mechanism, microstructure, mechanical properties and residual stresses

P92 steel and inconel 617 alloy welds joint produced using ERNiCr-3 filler with GTAW process: Solidification mechanism, microstructure, mechanical properties and residual stresses

Microstructure Evolution at Ni/Fe Interface in Dissimilar Metal Weld between Ferritic Steel and Austenitic Stainless Steel

Residual stress analysis, microstructural characterization, and mechanical properties of tungsten inert gas-welded P92/AISI 304L dissimilar steel joints

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