Experimental investigation on formability and microstructure of AZ31B alloy in electropulse-assisted incremental forming |
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| Affiliation: | 1. Department of Plasticity Technology, Shanghai Jiao Tong University, 1954 Huashan Rd, Shanghai, 200030, China;2. Department of Mechanical, Materials and Manufacturing Engineering, University of Nottingham, Nottingham, NG7 2RD, UK;1. Department of Plasticity Technology, Shanghai Jiao Tong University, 1954 Huashan Rd, Shanghai 200030, China;2. Department of Mechanical Engineering, University of Sheffield, Sheffield S1 3JD, UK;3. Department of Mechanical, Materials and Manufacturing Engineering, University of Nottingham, Nottingham NG7 2RD, UK;1. Department of Mechanical Engineering, Oregon State University, United States;2. Department of Industrial Engineering, Oregon State University, United States;3. Department of Automotive Engineering, Clemson University, United States;4. Department of Materials Science and Engineering, Clemson University, United States;1. Department of Plasticity Technology, Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai, 200030, China;2. Department of Mechanical Engineering, University of Sheffield, Western Bank, Sheffield S10 2TN, UK;3. Department of Mechanical Engineering, Northwestern Univsersity, Evanston, IL 60208-3111, USA;1. Department of Plasticity Technology, Shanghai Jiao Tong University, 1954 HuaShan Road, Shanghai 200030, China;2. Department of Mechanical, Materials and Manufacturing Engineering, University of Nottingham, Nottingham NG7 2RD, UK;3. Department of Mechanical Engineering, Northwestern University, Evanston, IL 60208, USA |
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| Abstract: | Based on a CNC machine tool and a high-energy electropulse generator, a self-built experiment platform was employed to conduct electropulse-assisted incremental forming (EAIF) of AZ31B alloy. The experimental results show that the electroplastic effect increases with the increase of the root mean square (RMS) current density of electropulse, and the forming limit angle in EAIF have been up to 72° from the previous 39.6° without electropulse. The tests prove that the peak current density plays a leading role in determining the materials formability when the RMS current density remains to be approximate. In addition, the microstructure transformations of the formed specimens were studied by means of optical microscopy and scanning electron microscopy. It is found that the electropulse can reduce the AZ31B dynamic recrystallization (DRX) temperature and accelerate the DRX progress, and it can also restrain the crack growth of the tested materials which in turn improves its formability. |
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