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Mechanical behavior and microstructure of low-carbon steel undergoing low-frequency vibration-assisted tensile deformation

Published online by Cambridge University Press:  20 September 2017

De’an Meng ,
Xuzhe Zhao ,
Jingxiang Li ,
Shengdun Zhao  and
Qingyou Han
De’an Meng
Affiliation:
School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China; and School of Engineering Technology, Purdue University, West Lafayette, Indiana 47906, USA
Xuzhe Zhao
Affiliation:
School of Engineering Technology, Purdue University, West Lafayette, Indiana 47906, USA
Jingxiang Li*
Affiliation:
School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China; and Xi’an Jiaotong University Suzhou Academy, Suzhou, Jiangsu 215123, People’s Republic of China
Shengdun Zhao
Affiliation:
School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, People’s Republic of China
Qingyou Han
Affiliation:
School of Engineering Technology, Purdue University, West Lafayette, Indiana 47906, USA
*
a) Address all correspondence to this author. e-mail: jxli.xjtu@mail.xjtu.edu.cn
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Abstract

Ultrasonic vibration can lead to significant load reduction in metal forming, and this concept has been widely applied in microforming. Recently, we discovered that low-frequency mechanical vibration (less than 100 Hz) with micro-amplitudes also features the same effects. In this study, low-frequency vibration-assisted tensile deformation experiments were conducted on commercially low-carbon steel. Effects of vibration softening and residual softening were obtained during experiments. Both these softening effects became prominent at high vibration amplitudes. Detailed microstructural analyses reveal that a low-frequency vibration treatment altered the interior characteristics of the metal. Electron backscatter diffraction results showed low-angle grain boundaries, and the interior misorientation angle increased greatly with the application of a low-frequency vibration. Changes in the microstructure became more pronounced with the rise of vibration amplitudes. Instantaneous stress reduction results from the additional energy applied in the form of vibration, which lowers the barrier energy for the dislocation motion. The residual softening effect can be interpreted via a dislocation density decrease as a result of vibration markedly improving the opportunity for dislocation annihilation or stacking.

Keywords

vibration softeningresidual softeningsubgrains formationdislocations
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 20 , 27 October 2017 , pp. 3885 - 3893
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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