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Deformation Behavior of a Thin-Walled Tube in Hydroforming with Radial Crushing Under Pulsating Hydraulic Pressure

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Abstract

Loading path plays a dominant role in tube hydroforming (THF), and the pulsating loading path has been reported capable of improving the formability of a tube in hydrobulging with axial feeding. As a new THF process, the tube hydroforming with radial crushing (THFRC) is receiving increasing attention; however, knowledge on the process still remains insufficient to extend its application to various other fields. In this study, the experiments of THFRC under both the pulsating and the linear hydraulic pressures were carried out to investigate the deformation behavior. The influences of the amplitude and the frequency of the pulsating hydraulic pressure on the shape precision, wall thickness, and the microstructures of the deformed parts were analyzed. Subsequently, metallographic examinations of the deformed specimens were conducted in an attempt to clarify the relationship between the microstructural evolution and deformation behavior. The mechanism of formability improvement in THFRC by the pulsating hydraulic pressure was explored from the perspective of microstructure. Compared with the linear hydraulic pressure, the pulsating hydraulic pressure could generate a higher shape precision, a more uniform wall thickness, as well as less martensites, and larger grain. The microstructural evolution induced by the pulsating loading path is supposed to contribute to the formability improvement of SUS304 stainless steel tubes.

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Acknowledgments

The authors gratefully acknowledge the supports of the National Natural Science Foundation of China (Grant number 51065006&51271062), Guangxi Natural Science Foundation (Grant number 2013GXNSFAA019305), and Guangxi Key Laboratory of Manufacturing System & Advanced Manufacturing Technology (Grant number 11-031-12_006).

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Correspondence to Lianfa Yang.

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Yang, L., Rong, H. & He, Y. Deformation Behavior of a Thin-Walled Tube in Hydroforming with Radial Crushing Under Pulsating Hydraulic Pressure. J. of Materi Eng and Perform 23, 429–438 (2014). https://doi.org/10.1007/s11665-013-0783-9

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  • DOI: https://doi.org/10.1007/s11665-013-0783-9

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