Comparisons of Different Oxide Fluxes in Activated Gas Tungsten Arc Welding of Duplex Stainless Steels for Improved Depth of Penetration and Pitting Corrosion Resistance

Nanavati, Purvesh K.; Badheka, Vishvesh J.; Jaynish, Idhariya; Darshan, Solanki

doi:10.1080/2374068x.2021.1916283

Cited by 3 publications

(2 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1,2 These steels possess superior mechanical properties, such as high strength, proper elastic modulus between 180 and 200 GPa at 300°C, and good fracture toughness as well as excellent corrosion/corrosion-mechanical behavior due to their microstructure. [4][5][6][7][8][9] The applications of duplex stainless steels can include important industries, such as automotive, naval, nuclear, oil, gas, petrochemical, pulp, and paper industries, as well as heat exchangers and subsea equipment. 2,6,8,10,11 Inconel 718, as a nickeland iron-based superalloy, is of high importance among high-temperature alloys and is a precipitate-hardenable alloy.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6][7][8][9] The applications of duplex stainless steels can include important industries, such as automotive, naval, nuclear, oil, gas, petrochemical, pulp, and paper industries, as well as heat exchangers and subsea equipment. 2,6,8,10,11 Inconel 718, as a nickeland iron-based superalloy, is of high importance among high-temperature alloys and is a precipitate-hardenable alloy. [12][13][14][15] Its microstructure normally comprises nickelbased solid solution, such as γ phase (matrix), twins, and carbides.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Microstructure and tensile-shear behavior of dissimilar resistance spot welds between 2304 duplex stainless steel and Inconel 718 superalloy

Badkoobeh

Mostaan

Rafiei

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

View full text Add to dashboard Cite

Dissimilar joints between duplex stainless steels and nickel-based superalloys are of high significance in some industries. In this research, 2304 duplex stainless steel and Inconel 718 superalloy were welded by the resistance spot welding technique. The studies showed that the fusion zone microstructure was composed of a dendritic structure related to the grains of nickel-based solid solution ( γ-phase) and γ′ islands. The heat-affected zone microstructure of 2304 duplex stainless steel includes the austenite phase with a slight volume fraction and the ferrite phase with a high volume fraction. The austenite phase was formed with two morphologies of Widmanstätten and grain boundary allotriomorphs. The heat-affected zone microstructure of Inconel 718 superalloy also contained γ phase (nickel-based solid solution), annealing twins, and some precipitates. The results of the tensile-shear test revealed that tensile-shear strength (i.e. peak load) and fracture energy were increased by increasing the welding current from 1 to 2 kA and the welding time from 1 to 2 s. However, they were reduced by increasing the welding current from 2 to 4 kA and the welding time from 2 to 4 s. This was caused by the surface splash between the electrodes and the sheets. In the above-mentioned range, an increase in the welding current and time may also intensify the surface splash. It was also found that when the welding time was constant (i.e. 2 s), the spot weld obtained at the welding current of 1 kA failed by interfacial fracture mode. All spot welds obtained at the welding currents of 2, 3, and 4 kA failed by pull-out fracture mode. On the other hand, all spot welds associated with the welding times of 1, 2, 3, and 4 s failed by PF mode when the welding current was constant (i.e. 3 kA).

show abstract