Microstructure and thermal cracking susceptibility of dissimilar resistance spot welded austenitic and mild steels

Li, Xiqing; Liu, Wei; Liu, Huiyu; Zhang, Zhiguo; Bao, Peiwei

doi:10.1007/s40194-022-01440-z

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…in this. 47 Li et al 48 joined 301LN cold-rolled ASS to Q235B mild steel via the RSW process. They could find columnar dendrites (CD) including the martensite phase ( α ′ ) as well as a low fraction of δ -ferrite phase and very tinny interdendritic (ID) austenite phase in the WM.…”

Section: Resultsmentioning

confidence: 99%

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Dissimilar joining of duplex AISI 2304 stainless steel/austenitic AISI 321 stainless steel using resistance spot welding technique: Microstructural evolutions, tensile-shear properties, and fracture analysis

Badkoobeh,

Mostaan,

Rafiei

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this work, microstructural characteristics and mechanical performance of spot weld joints of AISI 321 austenitic stainless steel (ASS)/AISI 2304 duplex stainless steel (DSS) were experimentally assessed. The welding current and time were varied to determine their effects on the failure load/energy and mechanism of dissimilar welds. The weld metal (WM)’s microstructure had a ferritic matrix as well as a distribution of grain boundary, Widmanstätten, and transgranular austenite. Some precipitates were found in the weld. The heat-affected zone (HAZ) of the AISI 321 ASS did not experience extensive phase evolutions and only grain coarsening occurred. This led to the HAZ softening. While extensive phase transformations were identified in the HAZ of the AISI 2304 DSS. Its microstructure contained a ferrite matrix with Widmanstätten and grain boundary-type austenite. Such microstructure resulted in the HAZ strengthening. Alteration of the welding condition from 1 kA – 2 s to 3 kA – 2 s raised peak load (tensile-shear strength) from 9.7± 0.8 to 16± 1 kN and energy absorbed to fracture from 15.52 ±1 to 51.2± 2 J. Enhanced WM size was responsible for them. Finally, as welding condition reached 4 kA – 2 s, they would decrease to 14.4±1 kN and 41.76± 3 J, respectively. It arises from surface splash. Once the welding condition varied from 3 kA – 1 s to 3 kA – 3 s, the weld performance was promoted i.e., improvement of peak load from 13± 1 to 19.6± 0.5 kN and energy absorbed to fracture from 23.4±2 to 49±3 J. It results from the WM enlarged. Ultimately, welding condition of 3 kA – 4 s causes a degradation in the weld performance i.e., drop of peak load to 15.8±1 kN and energy absorbed to fracture to 33.18± 2 J. This was on account of surface splash. With reference to the fracture analysis, interfacial, single pull-out, and double pull-out fracture modes were characterized.

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Section: Resultsmentioning

confidence: 99%

“…They could find columnar dendrites (CD) including the martensite phase ( α ′ ) as well as a low fraction of δ -ferrite phase and very tinny interdendritic (ID) austenite phase in the WM. In their work, the phase changes road for the WM was summarized in following 48 :…”

Section: Resultsmentioning

confidence: 99%

Dissimilar joining of duplex AISI 2304 stainless steel/austenitic AISI 321 stainless steel using resistance spot welding technique: Microstructural evolutions, tensile-shear properties, and fracture analysis

Badkoobeh,

Mostaan,

Rafiei

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part C:

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Experimental Study of Dissimilar Double Pulse Resistance Spot Welded Austenitic Stainless Steel and Weathering Steel

Li,

Liu,

Chen

et al. 2024

Met. Mater. Int.

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Mechanical and microstructural characterization of resistance spot welded dissimilar TWIP1000/TRIP800 joints

Özen

2023

Materials Testing

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In this work, resistance spot weldability of dissimilar TWIP1000/TRIP800 joint was investigated in terms of microstructural and mechanical characterization. The maximum tensile-shear load bearing capacity was 16,918 N in 6 kA welding current with 30 cycles of welding duration. Pull-out failure which was dominant and interfacial failure modes were obtained in tensile-shear tests. Although heat affected zone of the TRIP steel was totally transformed into tempered martensite, it showed better separation performance than TWIP steel. Heat affected zone of the TWIP steel was narrow, secondary phase formations and sudden grain coarsening have compromised the weakest point in the resistance spot welded joint.

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Microstructure and thermal cracking susceptibility of dissimilar resistance spot welded austenitic and mild steels

Cited by 3 publications

References 24 publications

Dissimilar joining of duplex AISI 2304 stainless steel/austenitic AISI 321 stainless steel using resistance spot welding technique: Microstructural evolutions, tensile-shear properties, and fracture analysis

Dissimilar joining of duplex AISI 2304 stainless steel/austenitic AISI 321 stainless steel using resistance spot welding technique: Microstructural evolutions, tensile-shear properties, and fracture analysis

Experimental Study of Dissimilar Double Pulse Resistance Spot Welded Austenitic Stainless Steel and Weathering Steel

Mechanical and microstructural characterization of resistance spot welded dissimilar TWIP1000/TRIP800 joints

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