Influence of thermomechanical treatments on the microstructure and mechanical properties of AISI 304L welds

Wang, Peng; Szalowski, Bartlomiej; Vallant, Rudolf; Poletti, Cecilia; Enzinger, Norbert

doi:10.1080/09507116.2023.2182728

Cited by 2 publications

(5 citation statements)

References 35 publications

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“…Furthermore, the TMW process broadens the FZ width as the result of flattening influence due to the plastic deformation, especially in the t 8/5 range of [5 s, 20 s] (see Fig. 4 d), which is similar to the work on the austenitic stainless steel [ 27 ].…”

Section: Resultssupporting

confidence: 70%

“…The positions of the chisel and torch are shown in Fig. 2 b and in our previous works [ 27 , 31 , 32 ]. The arc welding power source was Magic Wave 2000 Fuzzy (produced by Fronius), and welding was with DCEN for all experiments.…”

Section: Methodsmentioning

confidence: 73%

“…The pneumatic hammer moves vertically with a free stroke of 13 ± 0.5 mm, and a cycling frequency of 35 Hz at a constant air pressure of 6 bar. Additionally, two kinds of vibrations were acted simultaneously in the TMW process, namely, mechanical and heat-source vibrations [ 27 ]. In this work, the hammering offsets of 20 mm and 30 mm were selected to investigate the hammering deformation on modifying the solidified structure at different cooling temperatures.…”

Section: Methodsmentioning

confidence: 99%

“…3 c). The geometry and size of the DZ is highly dependent on the chisel tip dimension [ 27 ]. Figure 3 a shows the dimensions of both TIG and TMW welds, i.e.…”

Section: Methodsmentioning

confidence: 99%

“…The single plastic deformation through the WeldForming process was used by Adams et al [ 26 ] to improve the weld seam properties of HSSs. Our previous work [ 27 ] demonstrated that the plastic deformation combined with frequent vibrations during thermomechanical welding (TMW) can refine the microstructure of the FZ by occurring recrystallisation processes. We noticed that the TMW includes two types of vibrations: mechanical and heat source.…”

Section: Introductionmentioning

confidence: 99%

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The effect of thermomechanical welding on the microstructure and mechanical properties of S700MC steel welds

Wang,

Gomes,

Warchomicka

et al. 2024

Weld World

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Grain refinement by plastic deformation during conventional TIG welding can help to compensate for the loss of mechanical properties of welded joints. The thermomechanical welding (TMW) tests were performed on S700MC steel with different combinations of TIG arc energy and high frequency hammering over three target cooling times (t8/5 = 5s, 15s, and 25s). Additionally, the effect of initial microstructures on the weld joint quality was analysed by testing three materials conditions: hot-rolled (as-received) and cold-rolled with 10% and 30% thickness reductions, respectively. The effects of plastic deformation and the mechanical vibration on the grain refinement were studied separately. Optical microscopy, electron backscattered diffraction, and Vickers hardness were used to characterise the weld microstructure heterogeneity. The weld width and depth and the mean grain size were correlated as the function of cooling time t8/5. The results show that the weld dimensions increase with increasing the t8/5. The weld microstructures transformed from the mixed martensite and bainite into mixed ferrite and bainite with increasing the t8/5 time, and the related mean grain size increased gradually. The TMW welds exhibit smaller grains compared to TIG welds due to the coupled effects of mechanical vibration and plastic deformation. The mechanical vibration contributes to weld metal homogenisation, accelerating TiN precipitation in the fusion zone. The proposed TMW process can refine the weld microstructure of S700MC steel, enhancing its mechanical properties.

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Section: Resultssupporting

confidence: 70%

Section: Methodsmentioning

confidence: 73%

Section: Methodsmentioning

confidence: 99%

“…3 c). The geometry and size of the DZ is highly dependent on the chisel tip dimension [ 27 ]. Figure 3 a shows the dimensions of both TIG and TMW welds, i.e.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of thermomechanical welding on the microstructure and mechanical properties of S700MC steel welds

Wang,

Gomes,

Warchomicka

et al. 2024

Weld World

Self Cite

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The effect of thermomechanical welding on the microstructure and mechanical properties of S700MC steel welds

WANG,

Gomes,

Warchomicka

et al. 2023

Preprint

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Grain refinement by plastic deformation attempts to compensate for the loss of mechanical properties of welded joints during conventional TIG welding. We performed thermomechanical welding (TMW) tests on the S700MC steel with welding combinations of the TIG arc heating and frequent hammering over three target cooling times (t8/5 = 5s, 15s and 25s). Additionally, we analysed the effect of initial microstructures on the weld joint quality by testing three materials conditions: hot-rolled (as-received), and cold-rolled with 10% and 30% thickness reductions. We separately studied the effects of plastic deformation, and the mechanical vibration on the grain refinement. Optical microscopy, electron backscattered diffraction and Vickers hardness were used to characterise the weld microstructure heterogeneity. We correlated the weld width and depth, and the mean grain size as the function of cooling time t8/5. The results show that the weld dimensions increase as increasing the t8/5. The weld microstructures transformed from the mixed martensite and bainite into the mixed ferrite and bainite with increasing mean grain size as increasing the t8/5 time. The TMW welds exhibit smaller grains compared to TIG welds due to the coupled effects of the mechanical vibration and plastic deformation. The mechanical vibration contributes to weld metal homogenisation, accelerating TiN precipitation in the fusion zone. The proposed TMW process can refine the weld microstructures of S700MC steel, enhancing its mechanical properties.

show abstract

Influence of thermomechanical treatments on the microstructure and mechanical properties of AISI 304L welds

Cited by 2 publications

References 35 publications

The effect of thermomechanical welding on the microstructure and mechanical properties of S700MC steel welds

The effect of thermomechanical welding on the microstructure and mechanical properties of S700MC steel welds

The effect of thermomechanical welding on the microstructure and mechanical properties of S700MC steel welds

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