Analysis of microstructure evolution during different stages of closed-open cross wedge rolling

Analysis of microstructure evolution during different stages of closed-open cross wedge rolling Due to metal different flow rate at the position of part’s surface and its internal, the end of shaft parts formed from traditional open cross wedge rolling (CWR) would produce concave heart. Therefore, the material processing allowance must be considered, which will affect the forming quality and material utilization of parts. In order to solve the problem, the closed-open CWR technology is proposed in this paper. An automobile oil pump shaft made of 42CrMo material was regarded as the research object, and the simulation on part’s deformation, heat, and microstructure structure evolution is performed using finite element software DEFORM. The average grain size and dynamic re-crystallization volume fraction distribution in the first closed rolling stage, the second closed rolling stage, and open rolling stage were analyzed, respectively. Compared to the open CWR, the dynamic re-crystallization volume fraction in the process of the closed-open CWR can reach 100%; the average grain size can decrease to 20 μm. Combined with the rolling experiment, the grain size distribution of the high-temperature austenite grain size was obtained with metallographic analysis method; the average grain size of the experiment is proximately consistent with the simulation results, so the reliability of the closed-open CWR is verified. The results provide a reliable theoretical basis for further improving the material utilization of CWR and the comprehensive mechanical properties of rolled parts. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The International Journal of Advanced Manufacturing Technology Springer Journals

Analysis of microstructure evolution during different stages of closed-open cross wedge rolling

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Publisher
Springer Journals
Copyright
Copyright © 2017 by Springer-Verlag London Ltd., part of Springer Nature
Subject
Engineering; Industrial and Production Engineering; Media Management; Mechanical Engineering; Computer-Aided Engineering (CAD, CAE) and Design
ISSN
0268-3768
eISSN
1433-3015
D.O.I.
10.1007/s00170-017-1359-x
Publisher site
See Article on Publisher Site

Abstract

Due to metal different flow rate at the position of part’s surface and its internal, the end of shaft parts formed from traditional open cross wedge rolling (CWR) would produce concave heart. Therefore, the material processing allowance must be considered, which will affect the forming quality and material utilization of parts. In order to solve the problem, the closed-open CWR technology is proposed in this paper. An automobile oil pump shaft made of 42CrMo material was regarded as the research object, and the simulation on part’s deformation, heat, and microstructure structure evolution is performed using finite element software DEFORM. The average grain size and dynamic re-crystallization volume fraction distribution in the first closed rolling stage, the second closed rolling stage, and open rolling stage were analyzed, respectively. Compared to the open CWR, the dynamic re-crystallization volume fraction in the process of the closed-open CWR can reach 100%; the average grain size can decrease to 20 μm. Combined with the rolling experiment, the grain size distribution of the high-temperature austenite grain size was obtained with metallographic analysis method; the average grain size of the experiment is proximately consistent with the simulation results, so the reliability of the closed-open CWR is verified. The results provide a reliable theoretical basis for further improving the material utilization of CWR and the comprehensive mechanical properties of rolled parts.

Journal

The International Journal of Advanced Manufacturing TechnologySpringer Journals

Published: Nov 17, 2017

References

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