Prediction for cryogenic formability of AA2219 alloy cylindrical parts with friction stir weld
Source abstract
Abstract
A cryogenic deep drawing process was proposed for complex curved surface part forming with aluminum alloy friction stir welded (FSW) blanks. The experimental forming limit curves (FLCs) of AA2219 alloy FSW blanks were obtained using the Nakajima tests at -196 °C. The theoretical FLC of base metal (BM) and weld zone for the FSW blank were calculated by M-K theory, respectively. The limited drawing ratio (LDR) was tested by the deep drawing of the hemispherical bottom cylindrical parts, and the splitting behavior of the drawn-part at ultra-low temperature was accurately predicted using the numerical simulations combined with theoretical FLCs. It was found that the forming limits and LDR of the FSW blanks were improved at -196 °C, and the FLD0 and LDR reached to 0.27 and 1.90, respectively. The improved cryogenic deep drawability was attributed to hyper hardening and high plasticity of the FSW blanks, which help to transfer deformation and prevent localized deformation from splitting in weak deformation zone. Finally, three effective methods were further proposed to improve cryogenic formability of FSW blanks. The increased blank holder force can ensure the suppressed co-existence of wrinkling and splitting due to increased resistance to localized deformation ability during cryogenic deep drawing. The strain distribution between the weld and BM zone of the deep drawn parts was more uniform by isothermal condition. Furthermore, the cryogenic formability can be further improved for the FSW blank with an offset weld.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Metal Forming Simulation Techniques · Advanced Welding Techniques Analysis · Metallurgy and Material Forming
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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