Material flow control in tailor welded blanks by a combination of heat treatment and warm forming

Gnibl, Tobias; Merklein, Marion

doi:10.1016/j.cirp.2016.04.124

Cited by 6 publications

(1 citation statement)

References 14 publications

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“…Babu et al [13] employed solution treatment to improve the formability of the tailor welded blanks of two different materials, namely AA6061 and AA2014. Gnibl et al [14] improved the formability of the friction stir welding aluminum sheets by combination of increasing the forming temperature to 150 °C and by a heat treatment between 200 and 350 °C.…”

Section: Introductionmentioning

confidence: 99%

Correlation between softening mechanisms and deformation non-uniformity of laser-welded titanium alloy tube during gas bulging process

Wang

Liu

Politis

et al. 2017

Materials Characterization

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In this paper, post-weld annealing was carried out to adjust the flow stress difference between weld seam and base material (BM). Deformation non-uniformity of laser-welded titanium alloy tubes before and after annealing was evaluated by gas bulging at 800 °C. Results show that after double annealing (950 °C/2 h, air cooling + 600 °C / 2 h, air cooling), weld seam and BM had similar peak stress at first during tensile test at 800 °C, 0.001 s− 1, then the flow stress difference between them changed dynamically due to different softening rates. The maximum flow stress difference ratio was reduced from 36% to 17% after annealing. Deformation uniformity of the bulged tube was improved by 24.6% after annealing, but the higher softening rate of BM during gas bulging confined its further improvement. At early stage of gas bulging of the annealed tube, the main softening mechanism for weld seam was dynamic recovery and that for BM was globularization of secondary α and phase transformation of α to β. At middle-late stage of gas bulging, the main softening mechanism for weld seam was partial globularization of lamella α and that for BM was wide dynamic recrystallization

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Section: Introductionmentioning

confidence: 99%