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Evolution of Dynamic Recrystallization in 35CrMo Steel During Hot Deformation

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Abstract

To better understand the dynamic recrystallization (DRX) behavior of 35CrMo steel during hot deformation, a series of isothermal compression tests were carried out at different temperatures and strain rates. Using a constitutive equation built from the data obtained and the Arrhenius equation, the activation energy for hot deformation was determined through regression to be 342.69 kJ/mol. A model of the DRX kinetics was also constructed to characterize the influence of accumulated strain, temperature and strain rate on DRX evolution, which revealed that lower temperatures and higher strain rates require greater strain to achieve the same DRX volume fraction. Optical examination of the microstructure after deformation confirmed that this model accurately reflects reality and that grain size varies directly with deformation temperature, but inversely with strain rate.

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Acknowledgments

The authors are grateful for the financial support received from the National Program on Key Basic Research Project of China (No.2014CB046702) and to Wang Zi in the School of Powder Metallurgy Research Institute of Central South University, Changsha, for providing the testing facilities needed to carry out the present investigation.

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Authors and Affiliations

  1. Light Alloy Research Institute, Central South University, Changsha, 410012, China

    Zhengbing Xiao & Yu Liu

  2. School of Mechanical and Electrical Engineering, Central South University, Changsha, 410083, China

    Yuanchun Huang

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  1. Zhengbing Xiao
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  2. Yuanchun Huang
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  3. Yu Liu
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Correspondence to Zhengbing Xiao.

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Xiao, Z., Huang, Y. & Liu, Y. Evolution of Dynamic Recrystallization in 35CrMo Steel During Hot Deformation. J. of Materi Eng and Perform 27, 924–932 (2018). https://doi.org/10.1007/s11665-018-3220-2

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  • DOI: https://doi.org/10.1007/s11665-018-3220-2

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