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Study on the Microstructure and Texture Evolution of Hot Forged 20CrMnTiH Steel Spur Bevel Gear by Simulation and Experiment

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Abstract

Due to the non-uniform dynamic recrystallization (DRX) and deformation behavior during hot forging process, the spur bevel gears tend to receive heterogeneous microstructure which greatly affects their mechanical properties and service life. Therefore, the aim of this study is to investigate the evolution of microstructure and texture of hot forged 20CrMnTiH steel spur bevel gear utilizing both simulation and experiment method. In the present study, a sound finite element model of hot forging of a 20CrMnTiH steel spur bevel gear was developed under the Deform-3D software. The experimental analysis was conducted by employing scanning electron microscope, electron backscatter diffraction and transmission electron microscope. The simulation results indicated that the grain size, effective strain and DRX volume fraction were inhomogeneous from the surface region to the core region of gear tooth. The experimental analysis revealed that the surface region of gear tooth possessed the strongest γ-fiber and lowest dislocation density. However, both subsurface and core regions had a combination of moderate α- and γ-fibers, and large amount of dislocations pinned by precipitates can be observed in these two regions. Furthermore, the microhardness exhibited parabola distribution through the gear tooth, and the subsurface region possessed the largest microhardness value.

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Acknowledgments

The authors would like to thank the National Natural Science Foundation of China (No. 51575416), 111 Project (B17034), Innovative Research Team Development Program of Ministry of Education of China (No. IRT_17R83), Science and Technology Support Program of Hubei Province (No. 2015BAA039) and Wuhan Youth Science and Technology Plan (No. 2016070204010126) for the support given to this research.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China

    Xuan Hu

  2. Hubei Key Laboratory of Advanced Technology of Automotive Components, Wuhan University of Technology, Wuhan, 430070, China

    Xuan Hu, Lin Hua & Xinghui Han

  3. Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan University of Technology, Wuhan, 430070, China

    Xuan Hu, Lin Hua & Xinghui Han

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  1. Xuan Hu
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Correspondence to Lin Hua.

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Hu, X., Hua, L. & Han, X. Study on the Microstructure and Texture Evolution of Hot Forged 20CrMnTiH Steel Spur Bevel Gear by Simulation and Experiment. J. of Materi Eng and Perform 29, 3688–3701 (2020). https://doi.org/10.1007/s11665-020-04839-1

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